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Dissertations / Theses on the topic 'Mixed conduction'

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Published: 10 December 2022
Last updated: 28 January 2023

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1

Shah, Tejas Jagdish. "Online parameter estimation applied to mixed conduction/radiation." Thesis, Texas A&M University, 2005. http://hdl.handle.net/1969.1/2361.

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The conventional method of thermal modeling of space payloads is expensive and cumbersome. Radiation plays an important part in the thermal modeling of space payloads because of the presence of vacuum and deep space viewing. This induces strong nonlinearities into the thermal modeling process. There is a need for extensive correlation between the model and test data. This thesis presents Online Parameter Estimation as an approach to automate the thermal modeling process. The extended Kalman fillter (EKF) is the most widely used parameter estimation algorithm for nonlinear models. The unscented Kalman filter (UKF) is a new and more accurate technique for parameter estimation. These parameter estimation techniques have been evaluated with respect to data from ground tests conducted on an experimental space payload.
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2

Düvel, A., C. V. Chandran, and Paul Heitjans. "Mixed Ionic Conduction in Nano- and Microcrystalline BaLiF3." Diffusion fundamentals 21 (2014) 29, S.1-2, 2014. https://ul.qucosa.de/id/qucosa%3A32439.

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3

Kramer, Steve Andrew. "Mixed ionic-electronic conduction in rare earth titanate/zirconate pyrochlore compounds." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/26863.

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4

Sprague, John Jason 1971. "Mixed conduction and defect chemistry of manganese and molybdenum substituted gadolinium titanate pyrochlore." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/85250.

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5

Armstrong, Tad John. "Oxygen permeation properties of perovskite-related intergrowth oxides exhibiting mixed ionic-electronic conduction /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.

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6

Otake, Ken-ichi. "Studies on the Dimensional-Extended Halogen-Bridged Mixed-Valence Transition-Metal Complexes: Neutral-Chains and Nanotubes." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/217132.

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7

Vincent, Tyler Graham. "Total Temperature Probe Performance for Subsonic Flows using Mixed Fidelity Modeling." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/88867.

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An accurate measurement of total temperature in turbomachinery flows remains critical for component life models and cycle performance optimization. While many techniques exist to measure these flows, immersed thermocouple based probes remain highly desirable due to well established practices for probe design and implementation in typical industrial flow applications. However, as engine manufacturers continue to push towards higher maximum cycle temperatures and smaller flow passages, the continued use of these probes requires new probe designs considering both improved sensor durability and measurement accuracy. Increased maximum temperatures introduce many challenges for total temperature measurements using conventional immersed probes, including increased influences of conduction, convection, and radiation heat transfer between the sensor, fluid and the surroundings due to large thermal gradients present in real turbomachinery systems. While these effects have been previously investigated, the available design models are very limited to specific geometries and flow conditions. In this Dissertation, a more fundamental understanding of the flow behavior around typical vented shield style total temperature probes as a function of probe geometry and operating condition is gained using results from high-fidelity Computational Fluid Dynamics simulations with Conjugate Heat Transfer. A parametric study was conducted considering three non-dimensional probe geometric ratios (vent location to shield length (0.029-0.806), sensor diameter to shield inner diameter (0.252-0.672), and shield outer diameter to strut/mount thickness (0.245-0.759)) and three operating conditions (total temperature (70, 850, 2500°F) and pressure (1, 1, 10 atm), respectively) at a moderate Mach number of 0.4. Results were further quantified in the form of new empirical correlations necessary for rapid thermal performance evaluations of current and future probe designs. Additionally, a new mixed-fidelity or Reduced Order Modeling technique was developed which allows the coupling of high fidelity surface heat transfer data from CFD with a generalized form of the 1-D conducting solid equations for evaluating radiation and transient influences on sensor performance. These new flow and heat transfer correlations together with the new Reduced Order Modeling technique developed here greatly enhance the capabilities of designers to evaluate performance of current and future probe designs, with higher accuracy and with significant reductions in computational resources.
Doctor of Philosophy
An accurate measurement of total temperature in turbomachinery flows remains critical for component life models and cycle performance optimization. While many techniques exist to measure these flows, immersed thermocouple based probes remain highly desirable due to well established practices for probe design and implementation in typical industrial flow applications. However, as engine manufacturers continue to push towards higher maximum cycle temperatures and smaller flow passages, the continued use of these probes requires new probe designs considering both improved sensor durability and measurement accuracy. Increased maximum temperatures introduce many challenges for total temperature measurements using conventional immersed probes, including increased influences of conduction, convection, and radiation heat transfer between the sensor, fluid and the surroundings due to large thermal gradients present in real turbomachinery systems. While these effects have been thoroughly described and quantified in the past, the available design models are very limited to specific geometries and flow conditions. In this Dissertation, a more fundamental understanding of the flow behavior around typical vented shield style total temperature probes as a function of probe geometry and operating condition is gained using results from high-fidelity Computational Fluid Dynamics simulations with Conjugate Heat Transfer (CHT) capabilities. Results were further quantified in the form of new empirical correlations necessary for rapid thermal performance evaluations of current and future probe designs. Additionally, a new mixed-fidelity or Reduced Order Modeling (ROM) technique was developed which allows the coupling of high fidelity surface heat transfer data from CFD with a generalized form of the 1-D conducting solid equations for readily predicting the impact of radiation environment and transient errors on sensor performance.
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8

Lee, Chong-Hoon. "Study of reversible electrode reaction and mixed ionic and electronic conduction of lithium phosphate electrolyte for an electrolchemical co2 gas sensor." The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1073047249.

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9

Lee, Chong-Hoon. "Study of reversible electrode reaction and mixed ionic and electronic conduction of lithium phosphate electrolyte for an electrochemical CO₂ gas sensor." Columbus, Ohio Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1073047249.

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Thesis (Ph. D.)--Ohio State University, 2004.
Title from first page of PDF file. Document formatted into pages; contains xvi, 149 p.; also includes graphics (some col.). Includes abstract and vita. Advisor: Sheikh Akbar, Dept. of Materials Science and Engineering. Includes bibliographical references (p. 138-149).
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10

PIMENTA, MARCOS ASSUNCAO. "Transitions de phase a haute temperature et conduction ionique dans likso:(4) et composes apparentes." Orléans, 1987. http://www.theses.fr/1987ORLE2045.

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Etude par reflexion ir, diffusion brillouin et la mesure des conductivites electriques sur likso::(4), linaso::(4) et linh::(4)so::(4). Identification et analyse des differentes transitions; mise en evidence d'une relation etroite entre la mobilite cationique et les mouvements de rotationd es groupes sulfate. Observation d'une transition ordre-desordre a 435**(o)c, avec phse intermediaire a surstructure de basse symetrie, dans le cas de likso::(4)
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11

Goupil, Grégory. "Elaboration et caractérisation de matériaux d'anode à conduction mixte protonique / électronique pour l'électrolyse de la vapeur d'eau à haute température." Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENI024/document.

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Cette thèse valide le concept de matériaux céramiques conducteurs mixtes protoniques/électroniques et leur utilisation en tant qu.anode pour électrolyseur de la vapeur d.eau à température intermédiaire. Les matériaux développés sont des cobaltites d.alcalino-terreux et de terre-rares couramment utilisés pour leur forte conductivité électronique dans la gamme de températures 300-600°C. La stabilité de chaque matériau a été vérifiée pendant 350h sous air et sous vapeur d.eau. Après analyse de la compatibilité chimique avec le matériau d.électrolyte BaZr0.9Y0.1O3, huit compositions ont été sélectionnées représentatives de deux structures pérovskites, classique et lacunaire : BaCoO3, LaCoO3, Sr0.5La0.5CoO3, Ba0.5La0.5CoO3, GdBaCo2O5, NdBaCo2O5, SmBaCo2O5 et PrBaCo2O5. L.évolution thermique de la st.chiométrie en oxygène de chaque matériau a été déterminée en couplant le titrage par iodométrie et ATG sous air sec. Une série d.ATG sous air humidifié a permis de sélectionner la gamme de températures optimale dans laquelle l.incorporation des protons est possible et maximale. Les profils d.incorporation des protons ont été réalisés par SIMS microanalyse nucléaire en géométrie ERDA sur deux échantillons. Les coefficients de diffusion du deutérium ont pu être déterminés confirmant la mobilité des protons dans les cobaltites. Sous air humide, le composé lacunaire NdBaCo2O5 incorpore rapidement, un nombre significatif de protons qui se distribuent de façon homogène au c.ur de l.échantillon. L.optimisation microstructurale des anodes a permis d.obtenir à 450°C et 600°C des résistances totales de cellule symétrique très prometteuses
This thesis validates the concept of mixed electron/proton ceramic conductors to be used as anode materials for intermediate temperature steam electrolyzer. The materials developed are based on cobaltites of alkaline-earth metals and rare earth elements commonly used for their high electronic conductivity in the temperature range of 300-600°C. The stability of each material has been assessed during 350h in air and moist air. After checking the chemical compatibility with the BaZr0.9Y0.1O3 electrolyte material, eight compositions have been selected: BaCoO3, LaCoO3, Sr0.5La0.5CoO3, Ba0.5La0.5CoO3, GdBaCo2O5, NdBaCo2O5, SmBaCo2O5 and PrBaCo2O5. The thermal evolution of the oxygen stoichiometry of each material was determined by coupling iodometric titration and TGA in dry air. TGA in moist air has allowed determining the optimum temperature range for which proton incorporation is possible and maximized. Proton incorporation profiles have been determined on two cobaltites using SIMS and nuclear microanalysis in the ERDA configuration. Deuterium diffusion coefficients have been determined confirming the proton mobility in these materials. Under moist air, NdBaCo2O5 is shown to incorporate rapidly a significant number of protons that spread homogeneously within the material bulk. Anode microstructure optimization has allowed reaching at 450°C and 600°C total resistance values on symmetrical cell highly promising
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12

Dailly, Julian. "Synthèse et caractérisation de nouveaux matériaux de cathode pour piles à combustible à conduction protonique PCFC (Protonic Ceramic Fuel Cell)." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2008. http://tel.archives-ouvertes.fr/tel-00416109.

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Le développement de piles à combustibles capables de fonctionner à des températures intermédiaires de l'ordre de 400-600°C présente un grand intérêt tant du point de vue du vieillissement des matériaux que des différents éléments du système complet. Une des technologies envisagées est basée sur l'utilisation d'électrolyte céramique possédant une conduction protonique élevée (Protonic Ceramic Fuel Cell PCFC). A ce jour, un des problèmes principaux concerne les fortes surtensions observées au niveau de la cathode lors du passage d'un courant.
Dans ce cadre, le but de nos recherche a été de concevoir de nouveaux matériaux de cathode pour pile PCFC présentant de bonnes propriétés de conduction mixte ionique et électronique ainsi qu'une activité catalytique élevée vis-à-vis de la réaction de réduction de l'oxygène, entre 400 et 600°C. Plusieurs matériaux à conduction mixte ont été synthétisés à l'ICMCB, notamment des perovskites et des oxydes de structure de type Ruddlesden-Popper (en particulier les oxydes A2MO4+). Des analyses thermogravimétriques ont été réalisées pour étudier la stabilité de ces phases sous air humide, ainsi qu'une éventuelle insertion d'eau dans la structure. Des demi-cellules symétriques ont été élaborées pour les caractérisations éléctrochimiques par spectroscopie d'impédance complexe et voltampérométrie (mesures de résistances spécifiques de surface, courbes de polarisation cathodique).
Les caractérisations physico-chimiques et électrochimiques ont permit de sélectionner les meilleurs composés et ont conduit à la réalisation de la première monocellule PCFC utilisant le matériau de cathode Pr2NiO4+. Des densités de puissance de 100 mW/cm² ont été mesurées pour une température de fonctionnement de 600°C.
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13

Grimaud, Alexis. "Propriétés de conduction mixte O2- / H+ / e- dans quelques phases dérivées de la perovskite : application aux cathodes de piles à combustible H+-SOFC." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2011. http://tel.archives-ouvertes.fr/tel-00695911.

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La pile à combustible H+-SOFC (Protonic Conducting Solid Oxide Fuel Cell) basée surl'utilisation d'un électrolyte conducteur protonique peut représenter une alternative intéressanteà la pile SOFC qui présente actuellement le meilleur rendement. Cependant, la surtension à lacathode reste élevée et ce travail est dédié à la compréhension du mécanisme de réductionl'oxygène à cette électrode.Différents matériaux conducteurs mixtes O2- / e- de structures dérivées de la perovskite ABO3,tels que les doubles perovskites LnBaM2O5+d (Ln = Pr, Nd et Gd et M = Co et Fe) ainsi que lesphases de Ruddlesden-Popper A2MO4+d (Ln = Pr et Sr et M = Ni), ont été étudiés. Leur niveaude conductivité électronique ainsi que leur non-stoechiométrie en oxygène ont d'abord étédéterminées. Puis, à l'aide de la détermination des coefficients de diffusion de l'oxygène par laméthode de relaxation de conductivité électrique, leur conductivité ionique O2- a été estimée.Une étude électrochimique et plus spécialement la détermination des étapes limitant la réactionde réduction de l'oxygène à la cathode de pile H+-SOFC a ensuite permis de démontrer le rôledu proton dans le mécanisme de réaction pour les matériaux présentant les meilleuresperformances électrochimiques.Enfin, dans le cadre d'un projet ANR HPAC 2009 " CONDOR ", des mono-cellules de piles H+-SOFC ont été mises en forme et des densités de puissance proche de 180 mW/cm² à 0.6 V à600°C ont été obtenues.
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14

Thongyai, Kanthong. "Verification of high intensity air-conduction stimuli of ASSRs in profound and deaf, and, Correlations and comparisons of the mixed modulated exponential stimuli of ASSRs to pure tone stimuli of audiometry in normal hearing." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1448683.

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15

Cerisier, Jacky. "Caracterisation et etude physico-chimique de conducteurs ioniques afecl::(4) (a : alcalin) et de li::(4)fei::(6) : ionicite des liaisons mecanismes de conduction." Nantes, 1987. http://www.theses.fr/1987NANT2003.

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16

Richter, Jörg. "Mixed conducting ceramics for high temperature electrochemical devices /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17834.

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17

Shaw, Cynthia Kit Man. "Mass transport in mixed conducting perovskite related oxides." Thesis, Imperial College London, 2001. http://hdl.handle.net/10044/1/8380.

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18

Dhallu, Manjit. "Oxygen transport in mixed conducting LSM-YSZ composite materials." Thesis, Imperial College London, 2006. http://hdl.handle.net/10044/1/11340.

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19

Benson, Sarah Jennet. "Oxygen transport and degradation processes in mixed conducting perovskites." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391894.

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20

Baumann, Frank Stephan. "Oxygen reduction kinetics on mixed conducting SOFC model cathodes." [S.l. : s.n.], 2006. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-27056.

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21

Sansom, Jonathan E. H. "New ionic and mixed conducting materials for fuel cell applications." Thesis, University of Surrey, 2003. http://epubs.surrey.ac.uk/843346/.

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The project has dealt with the synthesis and characterisation of new materials for use in solid oxide fuel cells. In terms of potential electrolytes we have been studying a range of apatite based materials. High oxide ion conductivity has been recently reported in the apatite phases La10-yM6O26+/-z (M = Si, Ge). Preliminary work focused on the preparation and characterisation of single phase samples of previously reported phases, e.g. La9.33(Si/Ge)6O26 and La8A2(Si/Ge)6O26 (A = alkaline earth). Neutron diffraction studies revealed significant disorder within the oxygen channels for systems showing high oxide ion conductivity, namely non-stoichiometric systems containing either cation vacancies, e.g. La9.33Si6O26, or excess oxygen, e.g. La9SrSi6O26.5. Compositions containing excess oxygen showed the highest conductivities, e.g. 0.01 S cm-1 at 800 °C for La9SrSi6O26.5. Conversely, fully stoichiometric systems, e.g. La8Sr2Si6O26, showed poor oxide ion conduction, which appears to be associated with oxygen ordering within the channels. A range of doping studies followed in order to optimise the oxide ion conductivity, i.e. La9.33+x/3Si6-xMxO26 (M = Al, B, Ga) and (La/M)10-xSi6O26+/-y (M = Mg, Ca, Sr, Ba). The sample La9BaSi6O26.5 showed the highest conductivity, with a value of 6 x 10-3 S cm-1 at 500 °C, which is significantly higher than that of YSZ at this temperature (1 x 10-3 S cm-1). This sample is therefore a highly promising candidate material for use as an electrolyte in intemiediate temperature SOFCs (500 °C - 700 °C), as well as other technological applications. Similar studies were performed for samples with germanium in place of silicon. High oxide ion conductivity was observed for these systems, although germanium volatility was identified as a significant problem in these cases. In terms of cathode materials research has involved the preparation of a range of perovskite type phases based on YBa2Cu3O7-x (YBCO). The compositions tested were of formula type YSr2Cu3-xMxO7-y (M = Ga, Co, Fe), and the results indicated that these samples were not promising candidates as replacement cathode materials since, they all showed only moderately high conductivity. Furthermore, the phases were shown not to be chemically compatible with most current or prospective electrolyte materials, with significant impurity phases found to be produced when the electrolyte and cuprate were heated together at SOFC operating temperatures (900 °C - 1000 °C).
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22

Visetpotjanakit, Suputtra. "Mixed (ion and electron) conducting polymers, with applications in batteries." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/206171/.

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A new method to fabricate 3D batteries using mixed (ion and electron) conducting polymers as electrolytes has been developed. The majority of the work was done using the polymer Poly(1,11-Di(N-pyrryl)-3,6,9-trioxaundecane) (PP2O3) because it demonstrated mixed conducting properties. Methods are presented for synthesising the monomer then polymerising either electrochemically to give films or chemically to give bulk samples or powders. The conductivities of both polymers were determined by Electrochemical Impedance Spectroscopy (EIS). For polymer films prepared electrochemically on conducting substrates, the conductivities were determined as a function of the p-doping level, using a cell containing a liquid electrolyte and an applied bias potential. The results were fitted with a transmission line model and revealed an electronic conductivity varying from 4.20 x10-10 to 1.69 x10-5 S/cm dependent on the doping level, and a relatively constant ionic conductivity of 1.74 x10-6 S/cm. Oxidative treatment by overdoping resulted in a reduction of electronic conductivity by a factor of about 50,000 times smaller at the potential of maximum conductivity, around 0.30 V with a small change in the ionic conductivity. Bulk samples of the chemically prepared polymer were examined between two blocking electrodes. The electronic conductivities of the as-prepared and chemically oxidized samples were both quite low, around 10-7 and 10-8 S/cm, whereas the ionic conductivity of both samples was around 10-5 and 10-6 S/cm. These values were slightly higher than those of the film samples due to a presence of PC plasticiser in bulk samples. Finally the polymers were tested as electrolyte/separators in lithium ion battery cells: the electrochemically treated film was found to be an effective separator between a 3D LiFePO4 positive electrode and a liquid lithium amalgam negative, and the chemically prepared materials showed a capacity of around 150 mAh per gram LiFePO4 in a conventional Li/LiFePO4 cell,. These experiments demonstrate a proof of concept for the use of mixed conducting polymers as electrolytes in lithium battery systems
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23

Ashoka, Sahadevan Suchithra. "Anilate-based molecular building blocks for metal-organic frameworks and molecular conductors Conducting Anilate-Based Mixed-Valence Fe(II)Fe(III) Coordination Polymer: Small-Polaron Hopping Model for Oxalate-Type Fe(II)Fe(III) 2D Networks Nanosheets of Two-Dimensional Neutral Coordination Polymers Based on Near-Infrared-Emitting Lanthanides and a Chlorocyananilate Ligand." Thesis, Angers, 2019. http://bu.univ-angers.fr/Contact.

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Ce travail porte sur la synthèse et la caractérisation de matériaux moléculaires fonctionnels basés sur la molécule anilate et présentant des propriétés de conductivité, de magnétisme et de luminescence. Les anilates sont des dérivés de la 2,5-dihydroxy-1,4-benzoquinone substitués en positions 3 et 6 par une variété d’éléments (H, F, Cl, Br, I, CN, etc). Parmi eux, le seul composé hétérosubstitué ClCNAn2- a été choisi pour préparer une nouvelle famille de polymères de coordination bidimensionnels (PC 2D) avec des métaux de transition ou des ions lanthanides : i) un PC à valence mixte FeIIFeIII, de formule [TAG][FeIIFeIII(ClCNAn)3], contient pour la première fois le cation triaminoguanidinium dans un réseau de coordination.ii) Des PC basés sur le ligand ClCNAn2- et des ions lanthanides émettant dans le proche infrarouge (YbIII, NdIII, ErIII). Ces composés ont été exfoliés en monocouches, et des études de photoluminescence ont été menées à la fois sur les cristaux et les monocouches. iii) Une famille de PC hétéroleptiques basés sur des ions lanthanides et sur deux types de ligands pontants, le ligand ClCNAn2- et des ligands de type carboxylates (DOBDC et F4-BDC). iv) Une famille de PC basés sur des ions DyIII ont été préparés afin d’étudier leur propriétés magnétiques. v) Finalement, la capacité des ligands anilates à se combiner à des conducteurs moléculaires basés sur le BEDT-TTF a été démontrée à travers la synthèse et l’électrocristallisation de semiconducteurs organiques et de conducteurs magnétiques hybrides avec l’anion [Fe(ClCNAn)3]3-
This work reports on the design, synthesis and characterization of novel anilate-based functional molecular materials showing luminescent, magnetic and/or conducting properties. The family of anilate ligands comprises several derivatives obtained by introducing various substituents (H, F, Cl, Br, I, CN, etc.) at the 3 and 6 positions of the common 2,5-dihydroxy-1,4-benzoquinone framework. Among the anilate ligands, the only known heterosubstituted anilate with Cl/CN substituents at the 3,6 positions, ClCNAn2-, have been selected for preparing a novel family of 2D layered coordination polymers (2D CP) with both 3d metal ions and 4f lanthanide ions, through a general and straightforward synthetic strategy. i) Mixed-valence FeIIFeIII 2D CP, formulated as [TAG][FeIIFeIII(ClCNAn)3], containing, the tris(amino)-guanidinium (TAG) cation for the first time in such 2D networks has been synthesized and thoroughly characterized. ii) 2D CPs based on NIR-emitting lanthanides (YbIII, NdIII, ErIII) and the ClCNAn2- ligand, have been prepared and characterized. These layered compounds were exfoliated to nanosheets, by sonication-assisted solution synthesis. Time-resolved photoluminescence studies performed on both the bulk and nanosheets are also highlighted. iii) Novel family of heteroleptic 2D CPs based on NIR-emitting lanthanides and mixed ligands (ClCNAn2- and carboxylate ligands (DOBDC and F4-BDC)), were prepared and characterized. vi) Novel family of 2D CPs based on DyIII and ClCNAn2- were prepared in order to investigate their magnetic properties. v) Furthermore, the ability of anilate ligands to work as components of BEDT-TTF- based molecular conductors have been demonstrated through the synthesis, via electrocrystallization technique. vi) П-d hybrid multifunctional paramagnetic molecular conductors BEDT-TTF and [Fe(ClCNAn)3]3-) were also studied
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24

Zuo, Chendong. "Doping and Defect Structure of Mixed-conducting Ceramics for Gas Separation." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14009.

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My main objective is to gain a firm understanding of the correlation between the defect chemistry and the properties of Ba-based perovskite structure proton-conducting ceramics, especially B-site doped BaCeO3, so as to allow the engineering of these compounds with the desired properties for the application in devices; develop membranes of mixed protonic-electronic conductors suitable for hydrogen separation from gas mixtures; and further advance hydrogen separation technology by gaining fundamental understanding about electrochemical separation mechanism. BZCY proton conductors with various compositions have been synthesized and characterized. The absence of low-angle supercell reflections indicates a random B-site cation distribution. The substitution of Zr led to a decrease in cell volume and an enhanced structural stability against reactions with CO2. The total conductivity for BZCY pellets increased with temperature increased and decreased as the zirconium content increased at each fixed temperature. Dense Ni-BZCY composite membranes have been successfully fabricated for evaluating hydrogen permeability and stability. Doping Zirconium in the B-site only slightly reduced the hydrogen permeation at high temperatures, but dramatically increased the chemical stability in CO2- and H2O-containing gases. Among the compositions studied, the Ni-BZCY7 exhibited both highest H2 permeation rate and good chemistry stability, thus having potential for practical applications.
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25

Bernuy-Lopez, Carlos. "Novel mixed conducting oxides for sold oxide fuel cells (SOFC's) applications." Thesis, University of Liverpool, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501713.

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This thesis describes the search for new mixed conductors as potential anodes and cathodes for applications in Solid Oxide Fuel Cells. Several compounds have been synthesised and characterised by means of different diffraction techniques (X-Rays, neutrons and electrons), high resolution electron microscopy and electrical measurements (AC Impedance Spectroscopy and DC resistivity measurements).
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26

Geiger, Philipp [Verfasser]. "Straining Mechanisms in Mixed Ionic/Electronic Conductive Perovskite Ceramics / Philipp Geiger." München : Verlag Dr. Hut, 2019. http://d-nb.info/1200754956/34.

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27

Geiger, Philipp Torben [Verfasser]. "Straining Mechanisms in Mixed Ionic/Electronic Conductive Perovskite Ceramics / Philipp Geiger." München : Verlag Dr. Hut, 2019. http://d-nb.info/1200754956/34.

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28

Zhang, Ketian. "Mixed ion and electron conducting polymer composite membranes for artificial photosynthesis." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/121607.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2019
Cataloged from PDF version of thesis.
Includes bibliographical references.
Inspired by the fact that OH- has a very high mobility in water, highly conductive OH⁻conducting membranes were developed for alkaline water electrolysis. The membranes were semi-interpenetrating networks of crosslinked poly(vinyl alcohol) (PVA) and a polycation miscible with PVA. It is analogous to aqueous strong base solution. The polycation is a OH- containing polymer; PVA solvates this polycation and facilitates the ion conduction via Grotthuss mechanism. The membrane with proper composition has an exceptionally high OH⁻ conductivity of 151 mS/cm, 6.51 times as high as the commercial membrane Neosepta AHA. At the same time, the hydrogen bonds and covalent crosslinks in the system give this membrane a high tensile strength of 41 MPa in the wet state, 46% higher than the Neosepta AHA membrane. Insight in the ion conduction mechanism was gained by spectroscopic studies and the measurement of OH- conduction activation energy.
This material system is also highly anion perm-selective, a feature critical to sustaining the pH gradient in bipolar membrane based artificial photosynthesis devices. A highly transparent mixed proton and electron conducting membrane was developed. The Nafion and reduced graphene oxide (rGO) were chosen as the proton conducting polymer matrix and the electrically conductive filler respectively. The filler has a high aspect ratio. As predicted by simulations, it will have low percolation threshold if homogeneously dispersed. To achieve this homogeneity, water-aided mixing was employed followed by fast freezing in liquid nitrogen. Though rGO is a light absorber, the extremely low percolation threshold (0.1%) allows us to achieve sufficient electrical conductivity with only a small volume fraction of rGO. Therefore, the membrane was highly transparent in addition to its ability to conduct both electrons and protons.
Detailed modeling of the energy loss from conduction, light absorption, and gas crossover was conducted, showing that this material system is promising for the artificial photosynthesis application.
by Ketian Zhang.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Materials Science and Engineering
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29

Gibson, Dan Vladimir. "Scattering upon a mixed dielectric-conductor body: A time-domain approach." Thesis, University of Ottawa (Canada), 1992. http://hdl.handle.net/10393/10754.

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A time-domain integral equation technique is presented for calculating the behaviour of a mixed dielectric - conductive body subjected to a transient plane wave. The incident pulse is a smooth Gaussian pulse, approximating a delta function. We develop an original formulation capable of calculating the electric and magnetic fields on or outside the surface of the scatterer from the moment the incident wave hits the target. The result of the calculations is an impulse response providing information, via the Fourier transform, on the distribution of fields over a broad range of frequencies.
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30

Seehara, Panpailin. "Mixed-conducting LSC/CGO and Ag/CGO composites for passive seperation membranes." Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517682.

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Dense ceramic oxygen separation membranes can pass oxygen perm-selectively at elevated temperature and have potential for improving the performance and reducing the cost of several industrial processes: such as the conversion of natural gas to syngas, or to separate oxygen from air for oxy-fuel combustion in electricity generation (to reduce NOx emissions and facilitate CO2 sequestration). These pressure-driven solid state membranes are based on fast oxygen-ion conducting ceramics, but also need a compensating flow of electrons. Dual-phase composites are attractive since they provide an extra degree of freedom, compared with single phase membranes, for optimising the overall membrane performance. In this study, composites containing gadolinia doped ceria (CGO, Ce0.9Gd0.1O2- ) and either strontium-doped lanthanum cobaltite (LSC, La0.9Sr0.1CoO3- or La0.6Sr0.4CoO3- ) or silver (Ag) were investigated for possible application as oxygen separation membranes in oxy-fuel combustion system. These should combine the high oxygen ion conductivity of CGO with the high electronic conductivity and fast oxygen surface exchange of LSC or silver. Dense mixed-conducting composite materials of LSC/CGO (prepared by powder mixing and sintering) and Ag/CGO composites (prepared by silver plus copper oxide infiltration method) showed high relative density (above 95%), low background gas leakage and also good electrical conduction. The percolation threshold of the electronic conducting component was determined to be approximately 20 vol.% for both LSC compositions and 14 vol.% for Ag. Isotopic exchange and depth profiling by secondary ion mass spectrometry was used to investigated the oxygen tracer diffusion (D*) and surface exchange coefficient (k*) of the composites. Composites just above the electronic percolation threshold exhibited high solid state oxygen diffusivity, fast surface exchange activity moderate thermal expansion and sufficient mechanical strength thus combining the benefits of their constituent materials. The preliminary work on oxygen permeation measurement showed that the reasonable magnitude of oxygen fluxes is possible to be achieved. This indicates that the composites of LSC/CGO and Ag/CGO are promising for further development as passive oxygen separation membranes.
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31

Lu, Huanghai. "Preparation and performance of BSCF-based Mixed Ionic-Electronic Conducting (MIEC) ceramics." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/preparation-and-performance-of-bscfbased-mixed-ionicelectronic-conducting-miec-ceramics(bef05576-e133-4d72-825b-27d8982a2a8d).html.

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Preparation and performance of the perovskite-type barium strontium cobalt iron oxide (Ba_0.5 Sr_0.5 Co_0.8 Fe_0.2 O_(3-δ), BSCF) and its doped compositions were studied in this dissertation. Three transition metals (copper, nickel and niobium) were substituted into the parent BSCF at various ratios to create the formula Ba_0.5 Sr_0.5 (Co_0.8 Fe_0.2)_(1-x) M_x O_(3-δ) (0.02≤x≤0.30; M=Cu,Ni or Nb). Two synthetic methods (solid-state reaction and wet chemical co-precipitation) were developed for the preparation of starting powders. In the previous reports [1, 2], BSCF ceramics suffered from insufficient densification and severe cracking; these problems were resolved in this study by optimising the ceramic processing conditions. The phase transition sequences from starting powders to single-phase cubic perovskite were studied by SEM, XRD, TGA, EDS and Raman spectroscopy. The powders prepared by solid-state method were found to require higher calcination temperature to form pure perovskite phase, and an extra intermediate structure (Ba,Sr)Fe_2 O_4 was detected in the reaction sequence. The materials performance was examined from five aspects: thermal stability, chemical stability, oxygen permeability, electronic conductivity and mechanical performance. The secondary phases of thermal/chemical degradation were investigated, and a needle-like intragranular precipitate was originally discovered in this work. It was discovered that the niobium substitution could significantly improve BSCF’s thermal stability and chemical stability. The oxygen permeability and mechanical performance were also improved by niobium when the substitution ratios are small (< 10%). Although the electronic conductivity was lowered by niobium substitution as a trade-off, it does not become a drawback to restrict the materials’ potential applications as mixed ionic-electronic conductors (MIEC).Furthermore, the material system’s “composition - lattice structure - performance” relationships were systematically investigated in this work; the oxygen deficiency value (δ) and the average bond energy (ABE) were found to have strong correlations with the materials performance.
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32

Lai, Wei Haile Sossina M. "Impedance spectroscopy as a tool for electrochemical study of mixed conducting ceria /." Diss., Pasadena, Calif. : California Institute of Technology, 2007. http://resolver.caltech.edu/CaltechETD:etd-12072006-123745.

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33

Lankhorst, Martijn Henri Richard. "Thermodynamic and transport properties of mixed ionic-electronic conducting perovskite-type oxides /." Online version, 1997. http://bibpurl.oclc.org/web/21054.

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34

Hamdoune, Salaheddine. "Relations entre les structures et les propriétés de transport des solutions solides Li(1+x)Ti(2-x)In(x)P(3)O(12)." Grenoble 1, 1986. http://www.theses.fr/1986GRE10088.

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Etude cristallographique par diffraction rx d'electrons de li::(1+x) ti::(2-x) in::(x) p::(3) o::(7) et de li in p::(2) o::(7) afin de permettre une meilleure comprehension des mecanismes de transport de li**(+) dans ces composes. Suivant la concentration en in, les etudes structurales mettent en evidence trois phases differentes dans la solution solide. Les mesures de la conductivite ont montre que la modification des proprietes electriques est associee a l'etablissement d'une structure favorable a une conductivite elevee. C'est pourquoi cinq cristaux de compositions differentes ont ete etudies. Comme application, essai de realisation d'une pile a partir de la phase la plus conductrice : resultats prometteurs
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35

Zhang, Gong. "Modeling and characterization of mixed ionic-electronic conductor membranes for hydrogen separation." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/19018.

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36

Hammouche, Abderrezak. "Contribution à l'étude de La(1-x)Sr(x)MnO3 comme matériau d'électrode à oxygène à haute température." Grenoble INPG, 1989. http://www.theses.fr/1989INPG0075.

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Les composes la#1##xsr#xmno#3 sont utilises comme materiau d'electrode a oxygene utilisables dans les cellules galvaniques mettant en jeu un oxyde d'electrolytes solides. Leur caracterisation physicochimique a porte sur la determination de la structure cristalline et l'etude des proprietes thermiques et electriques
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37

Zahnert, Thomas, Robert Mlynski, Hubert Löwenheim, Dirk Beutner, Rudolf Hagen, Arneborg Ernst, Thorsten Zehlicke, et al. "Long-Term Outcomes of Vibroplasty Coupler Implantations to Treat Mixed/Conductive Hearing Loss." Karger, 2018. https://tud.qucosa.de/id/qucosa%3A38918.

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Objective: To evaluate the long-term safety and performance of four different vibroplasty couplers (round window, oval window, CliP and Bell coupler) in combination with an active middle ear implant. Methods: This was a multicentre, prospective, long-term study including 5 German hospitals. Thirty adult subjects suffering from conductive or mixed hearing loss were initially enrolled for the study, 24 of these were included in the final analysis with up to 36 months of postsurgical follow-up data. Bone conduction and air conduction were measured pre- and postoperatively to evaluate safety. Postoperative aided sound field thresholds and Freiburger monosyllable word recognition scores were compared to unaided pre-implantation results to confirm performance. Additional speech tests compared postoperative unaided with aided results. To determine patient satisfaction, an established quality-of-life questionnaire developed for conventional hearing aid usage was administered to all subjects. Results: Mean postoperative bone conduction thresholds remained stable throughout the whole study period. Mean functional gain for all couplers investigated was 38.5 ± 11.4 dB HL (12 months) and 38.8 ± 12.5 dB HL (36 months). Mean word recognition scores at 65 dB SPL increased from 2.9% in the unaided by 64.2% to 67.1% in the aided situation. The mean postoperative speech reception in quiet (or 50% understanding of words in sentences) shows a speech intelligibility improvement at 36 months of 17.8 ± 12.4 dB SPL over the unaided condition. The signal-to-noise ratio (SNR) improved by 5.9 ± 7.2 dB SNR over the unaided condition. High subjective device satisfaction was reflected by the International Inventory for Hearing Aids scored very positively. Conclusion: A significant improvement was seen with all couplers, and audiological performance did not significantly differ between 12 and 36 months after surgery.
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38

Seeharaj, Panpailin. "Mixed-conducting LSC/CGO and Ag/CGO composites for passive oxygen separation membranes." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/5724.

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Dense ceramic oxygen separation membranes can pass oxygen perm-selectively at elevated temperature and have potential for improving the performance and reducing the cost of several industrial processes: such as the conversion of natural gas to syngas, or to separate oxygen from air for oxy-fuel combustion in electricity generation (to reduce NOx emissions and facilitate CO2 sequestration). These pressure-driven solid state membranes are based on fast oxygen-ion conducting ceramics, but also need a compensating flow of electrons. Dual-phase composites are attractive since they provide an extra degree of freedom, compared with single phase membranes, for optimising the overall membrane performance. In this study, composites containing gadolinia doped ceria (CGO, Ce0.9Gd0.1O2- ) and either strontium-doped lanthanum cobaltite (LSC, La0.9Sr0.1CoO3- or La0.6Sr0.4CoO3- ) or silver (Ag) were investigated for possible application as oxygen separation membranes in oxy-fuel combustion system. These should combine the high oxygen ion conductivity of CGO with the high electronic conductivity and fast oxygen surface exchange of LSC or silver. Dense mixed-conducting composite materials of LSC/CGO (prepared by powder mixing and sintering) and Ag/CGO composites (prepared by silver plus copper oxide infiltration method) showed high relative density (above 95%), low background gas leakage and also good electrical conduction. The percolation threshold of the electronic conducting component was determined to be approximately 20 vol.% for both LSC compositions and 14 vol.% for Ag. Isotopic exchange and depth profiling by secondary ion mass spectrometry was used to investigated the oxygen tracer diffusion (D*) and surface exchange coefficient (k*) of the composites. Composites just above the electronic percolation threshold exhibited high solid state oxygen diffusivity, fast surface exchange activity moderate thermal expansion and sufficient mechanical strength thus combining the benefits of their constituent materials. The preliminary work on oxygen permeation measurement showed that the reasonable magnitude of oxygen fluxes is possible to be achieved. This indicates that the composites of LSC/CGO and Ag/CGO are promising for further development as passive oxygen separation membranes.
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39

Chiabrera, Francesco Maria. "Interface Engineering in Mixed Ionic Electronic Conductor Thin Films for Solid State Devices." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/667601.

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Interface-dominated materials such as nanocrystalline thin films have emerged as an enthralling class of materials able to engineer functional properties of transition metal oxides widely used in energy and information technologies. In this direction, it has been recently proved that grain boundaries (GBs) in the perovskite La1-xSrxMnO3±δ (manganite) deeply impact its functional properties, boosting the oxygen mass transport while abating the electronic and magnetic order. The impact of grain boundary in nanocrystalline thin films is so relevant to radically change the behaviour of the material, transforming an electronic conductor into a mixed ionic-electronic conductor functional for redox-based solid state devices. Based on these preliminary studies, it became crucial to understand the origin of this enhancement, in order to gain engineering capabilities and potentially extend it to other functional perovskite materials. Following this approach, this thesis focuses in analysing the remarkable properties of GBs in manganites and, ultimately, investigating the possibility of engineering these interfaces. First, the structural and chemical characterization of the LSM thin films deposited by pulsed laser deposition (PLD) is presented. The compositional analysis of the layers revealed a severe Mn deficiency, ascribed to the plasma-background interactions during the deposition. The analysis of the GBs of these Mn-deficient thin films revealed a remarkable local modification of ionic composition, consisting in a Mn and O depletion along with a La and Sr enrichment (viz. GBdef). Then, through a PLD combinatorial approach, Mn was progressively inserted in the perovskite structure, altering the overall cationic ratio of the thin films (Mn/(La+Sr)). The variation of cationic chemical potential of the thin films was observed to significantly affect the GB composition, which passed from Mn depletion (La-enrichment) to Mn enrichment (La-depletion), while maintaining an O deficiency character (viz. GBrich). This behaviour suggests that through the tuning of the overall cationic concentration in the thin films the GB composition can be altered, offering an innovative way for engineering chemical defects in strained interfaces. The effect of these different GBs on the electrical conductivity and the oxygen mass transport properties of LSM thin films with different Mn content was then measured. It was found that in the layers characterized by GBdef, the lack of Mn hinders the low temperature metal insulator transition and, in its place, a variable range hopping mechanism occurs, where electrons tunnels across the GBs for reaching distant Mn atoms. Moreover, a simultaneous decrease of activation energies of both GB oxygen diffusivity and GB oxygen surface exchange coefficient was observed further decreasing the Mn concentration in these thin films, indicating a strong interdependence between the two phenomena. The results suggest that the GB accumulation of oxygen vacancies is at the origin of the large improvement of both oxygen mass transport parameters observed in LSM polycrystalline thin films. In LSM thin films characterized by GBrich, the low temperature metallic behaviour is progressively restored and an increase of electronic conductivity is observed in the entire temperature range. Additionally, in these layers relative changes of Mn do not give rise to a variation of the oxygen diffusivity, meaning that the GBs oxygen vacancy concentration is not altered anymore. Overall, the results demonstrate the possibility of engineering the functional properties of LSM polycrystalline thin films by modifying the GB cationic composition. In the third part of the thesis, the effect of Co substitution on LSMC functional properties was investigated. The LSMC thin films were produced by combinatorial PLD, which allow a direct measure of real-continuous spread LSMC system. The oxygen mass transport properties of bulk and GB were evaluated by finite element model fitting of 18O exchange profiles. The results revealed that GBs enhance the transport properties of the whole material in the range of composition under study, although for high Co concentration the GB effect is concealed by the high bulk diffusion.
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40

Efimov, Konstantin [Verfasser]. "Mixed oxygen ionic and electron conducting perovskite oxides : issues and possible solutions / Konstantin Efimov." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2011. http://d-nb.info/1019234210/34.

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41

Joo, Jong-Hoon, Rotraut Merkle, Joachim Maier, Markus Kubicek, Judith Januschewsky, Jürgen Fleig, Andreas Oestereich, et al. "XPS on mixed conducting perovskites at elevated temperatures and close-to-ambient gas pressure." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-187968.

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42

Joo, Jong-Hoon, Rotraut Merkle, Joachim Maier, Markus Kubicek, Judith Januschewsky, Jürgen Fleig, Andreas Oestereich, et al. "XPS on mixed conducting perovskites at elevated temperatures and close-to-ambient gas pressure." Diffusion fundamentals 12 (2010) 67, 2010. https://ul.qucosa.de/id/qucosa%3A13897.

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43

Zahnert, Thomas, Hubert Löwenheim, Dirk Beutner, Rudolf Hagen, Arneborg Ernst, Hans-Wilhelm Pau, Thorsten Zehlicke, et al. "Multicenter Clinical Trial of Vibroplasty Couplers to Treat Mixed/Conductive Hearing Loss: First Results." Karger, 2016. https://tud.qucosa.de/id/qucosa%3A70599.

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Objective: To evaluate the safety and effectiveness of round window (RW), oval window (OW), CliP and Bell couplers for use with an active middle ear implant. Methods: This is a multicenter, long-term, prospective trial with consecutive enrollment, involving 6 university hospitals in Germany. Bone conduction, air conduction, implant-aided warbletone thresholds and Freiburger monosyllable word recognition scores were compared with unaided preimplantation results in 28 moderate-to-profound hearing-impaired patients after 12 months of follow-up. All patients had previously undergone failed reconstruction surgeries (up to 5 or more). In a subset of patients, additional speech tests at 12 months postoperatively were used to compare the aided with the unaided condition after implantation with the processor switched off. An established quality-of-life questionnaire for hearing aids was used to determine patient satisfaction. Results: Postoperative bone conduction remained stable. Mean functional gain for all couplers was 37 dB HL (RW = 42 dB, OW = 35 dB, Bell = 38 dB, CliP = 27 dB). The mean postoperative Freiburger monosyllable score was 71% at 65 dB SPL. The postimplantation mean SRT 50 (speech reception in quiet for 50% understanding of words in sentences) improved on average by 23 dB over unaided testing and signal-to-noise ratios also improved in all patients. The International Outcome Inventory for Hearing Aids (IOI-HA) quality-of-life questionnaire was scored very positively by all patients. Conclusion: A significant improvement was seen with all couplers, and patients were satisfied with the device at 12 months postoperatively. These results demonstrate that an active implant is an advantage in achieving good hearing benefit in patients with prior failed reconstruction surgery.
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44

Orikasa, Yuki. "Material Design for Mixed Conducting Perovskite Type Oxide Cathodes of High Temperature Electrochemical Devices." Kyoto University, 2010. http://hdl.handle.net/2433/120455.

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Kyoto University (京都大学)
0048
新制・課程博士
博士(人間・環境学)
甲第15489号
人博第519号
新制||人||126(附属図書館)
21||人博||519(吉田南総合図書館)
27967
京都大学大学院人間・環境学研究科相関環境学専攻
(主査)教授 内本 喜晴, 教授 堀 智孝, 教授 杉山 雅人, 教授 安部 武志
学位規則第4条第1項該当
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45

Packer, Robert. "Mixed conducting cerium niobate and substituted analogues for use in solid state electrochemical devices." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501180.

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46

Wahbi, Mernissi Khalid. "Étude exploratoire du système AG-HG-S : Synthèse de l'imitérite AG::(2)HGS::(2) stabilité thermique, caractérisation électrique et optique." Nancy 1, 1989. http://www.theses.fr/1989NAN10090.

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Synthèse par précipitation de solutions aqueuses de nitrates de HG et de AG et de sulfure de NA A 70**(O)C A 10
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47

Valentin, François. "Optimisation du silicium amorphe hydrogéné préparé par décharge luminescente à basse fréquence pour l'utilisation dans divers dispositifs de type diode Schottky." Grenoble 1, 1987. http://www.theses.fr/1987GRE10173.

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48

Guo, Yuyan. "Mixed ionic and electronic conducting electrode studies for an alkali metal thermal to electric converter." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1053.

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49

Li, Xiaoyu [Verfasser]. "Long term stability and permeability of mixed ion conducting membranes under oxyfuel conditions / Xiaoyu Li." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2013. http://d-nb.info/1046667149/34.

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50

Druce, John W. "Mixed conducting CGO-LSCF Composites for Oxygen Separation in Oxyfuelled Carbon Capture and Storgage Systems." Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526368.

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