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Добірка наукової літератури з теми "Oxygen Ion Conductors"

Автор: Grafiati
Опубліковано: 7 вересня 2023

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Статті в журналах з теми "Oxygen Ion Conductors"

1

Skinner, Stephen J., and John A. Kilner. "Oxygen ion conductors." Materials Today 6, no. 3 (March 2003): 30–37. http://dx.doi.org/10.1016/s1369-7021(03)00332-8.

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2

Zhu, Bin. "Advanced Hybrid Ion Conducting Ceramic Composites and Applications in New Fuel Cell Generation." Key Engineering Materials 280-283 (February 2007): 413–18. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.413.

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Анотація:
Our developments on ceramic composite conductors have experienced about 15 years from the oxyacid-salts oxide proton-based conductors, non-oxide containment salts, the ceria-based composite electrolytes, hybrid proton and oxygen ion conductors and nano-composites. A special emphasis is paid to new functional nano-composites based on hybrid proton and oxygen ion conductors that have demonstrated advanced properties and fuel cell applications, e.g., excellent ionic conductivity of 0.01 to 1 Scm-1 and performances of 200 - 1000 mWcm-2 for temperatures achieved for fuel cells between 400 and 700°C. Some proton and oxygen ion conducting mechanisms in the materials are reviewed and discussed. The hybrid ion conduction and dual electrode reactions and processes create a new generation fuel cell system.
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3

Hull, S. "Neutron diffraction studies of oxygen ion conductors." Acta Crystallographica Section A Foundations of Crystallography 58, s1 (August 6, 2002): c30. http://dx.doi.org/10.1107/s0108767302086300.

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4

Suemoto, T., and M. Ishigame. "Quasielastic light scattering in oxygen-ion conductors." Physical Review B 33, no. 4 (February 15, 1986): 2757–64. http://dx.doi.org/10.1103/physrevb.33.2757.

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5

Steele, B. C. H. "Oxygen ion conductors and their technological applications." Materials Science and Engineering: B 13, no. 2 (March 1992): 79–87. http://dx.doi.org/10.1016/0921-5107(92)90146-z.

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6

TERANISHI, Takashi. "Broadband spectroscopy of dielectrics and oxygen-ion conductors." Journal of the Ceramic Society of Japan 125, no. 7 (2017): 547–51. http://dx.doi.org/10.2109/jcersj2.17083.

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7

Winkless, Laurie. "Neutrons lead the search for oxygen ion conductors." Materials Today 18, no. 9 (November 2015): 473. http://dx.doi.org/10.1016/j.mattod.2015.09.003.

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8

Marques, F. M. B., and V. V. Kharton. "Development of oxygen ion conductors: One relevant tendency." Ionics 11, no. 5-6 (September 2005): 321–26. http://dx.doi.org/10.1007/bf02430241.

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9

Muñoz, R. A., Paola Cristina Cajas, J. E. Rodriguez, A. C. Rodrigues, and Cosme R. M. Silva. "Polycrystalline Tetragonal Zirconia of the Form ZrO2: 3 mol% Re2O3 (Re-TZP) for Use in Oxygen Sensors: Synthesis, Characterization and Ionic Conductivity." Materials Science Forum 798-799 (June 2014): 145–53. http://dx.doi.org/10.4028/www.scientific.net/msf.798-799.145.

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Анотація:
Oxygen ion conductors of zirconia based ceramics are a class of materials with technological applications in several application areas: sensors of chemical species, oxygen pumps, solid oxide fuel cells among others [1]. For these applications, the zirconia must possess the fluorite type crystal structure, or close to it. Such oxides with this structure are the classic oxygen ion conductors [2]. The fluorite structure consists of a cubic lattice of oxygen ions surrounded by cations. The cations are arranged in a face centered cubic structure with anions occupying tetrahedral positions. This leads to an open structure with large empty octahedral interstices.
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10

Norby, Truls. "Fast oxygen ion conductors—from doped to ordered systems." Journal of Materials Chemistry 11, no. 1 (2001): 11–18. http://dx.doi.org/10.1039/b003463k.

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Більше джерел

Дисертації з теми "Oxygen Ion Conductors"

1

Martin, Manfred. "Oxygen and cation diffusion processes in oxygen ion conductors." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-193656.

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We discuss oxygen and cation diffusion processes in oxygen ion conductors. While the high oxygen diffusivity determines the proper oxygen ion conductivity, slow cation diffusion processes are important for sintering and degradation processes. In the first part of the paper we discuss an analytical model for the ionic conductivity of a strongly acceptor doped, fluorite-type oxygen ion conductor, i.e. a concentrated solution of AO2 and BB2O3. The model can be applied, e.g., to yttria doped zirconia (YSZ) and gives a qualitative explanation of the observed maximum of the conductivity as a function of the dopant fraction. The model considers nearest neighbor interactions between oxygen vacancies and dopant cations, which may be negligible, attractive or repulsive, and jump barriers that depend on the nature of the cation-cation edge that has to be crossed during a jump between adjacent oxygen sites. In the second part we discuss cation diffusion processes in doped lanthanum gallates (LSGM). The experimental results of nearly identical cation diffusion coefficients in the A- and B-sublattices of the perovskite LSGM can be explained by a bound defect cluster mechanism containing cation vacancies of both the Aand the B- sublattice and anion vacancies.
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2

Martin, Manfred. "Oxygen and cation diffusion processes in oxygen ion conductors." Diffusion fundamentals 6 (2007) 39, S. 1-16, 2007. https://ul.qucosa.de/id/qucosa%3A14216.

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Анотація:
We discuss oxygen and cation diffusion processes in oxygen ion conductors. While the high oxygen diffusivity determines the proper oxygen ion conductivity, slow cation diffusion processes are important for sintering and degradation processes. In the first part of the paper we discuss an analytical model for the ionic conductivity of a strongly acceptor doped, fluorite-type oxygen ion conductor, i.e. a concentrated solution of AO2 and BB2O3. The model can be applied, e.g., to yttria doped zirconia (YSZ) and gives a qualitative explanation of the observed maximum of the conductivity as a function of the dopant fraction. The model considers nearest neighbor interactions between oxygen vacancies and dopant cations, which may be negligible, attractive or repulsive, and jump barriers that depend on the nature of the cation-cation edge that has to be crossed during a jump between adjacent oxygen sites. In the second part we discuss cation diffusion processes in doped lanthanum gallates (LSGM). The experimental results of nearly identical cation diffusion coefficients in the A- and B-sublattices of the perovskite LSGM can be explained by a bound defect cluster mechanism containing cation vacancies of both the Aand the B- sublattice and anion vacancies.
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3

Zhang, Yaoqing. "Exploring novel functionalities in oxide ion conductors with excess oxygen." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/2576.

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Анотація:
Functional materials, particularly metal oxides, have been the focus of much attention in solid state chemistry for many years and impact every aspect of modern life. The approach adopted in this thesis to access desirable functionality for enhanced fundamental understanding is via modifying existing materials by deploying reducing synthetic procedures. This work spans several groups of inorganic crystalline materials, but is unified by the development of new properties within host compounds of particular relevance to solid oxide fuel cell technology, which allow interstitial oxide ion conduction at elevated temperatures. The Ca₁₂Al₁₄O₃₂e₂ electride was successfully synthesized by replacing the mobile extra-framework oxygen ions with electrons acting as anions. The high concentration of electrons in the C12A7 electride gives rise to an exceptionally high electronic conductivity of up to 245 S cm⁻¹ at room temperature. Making use of the high density of electrons in Ca₁₂Al₁₄O₃₂e₂ electride, the strong N-N bonds in N₂ was found to be broken when heating Ca₁₂Al₁₄O₃₂e₂ in a N₂ atmosphere. A reaction between silicate apatites and the titanium metal yielded another completely new electride material La₉.₀Sr₁.₀(SiO₄)₆O₂.₄e₀.₂ which was found to be a semiconductor. To fully understand the role of oxygen interstitials in silicate apatites, high-resolution transmission electron microscopy (HRTEM) was employed as the main technique in probing how the oxygen nonstoichiometry is accommodated at the atomic level. Atomic-resolution imaging of interstitial oxygen in La₉.₀Sr₁.₀(SiO₄)₆O₂.₅ proved to be a success in this thesis. Substitution of oxygen in 2a and interstitial sites with fluoride ions in La[subscript(8+y)]Sr[subscript(2- z)](SiO₄)₆O[subscript(2+(3y-2z)/2)] (0
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4

Frydenlund, Madelen Mørk. "Development of a new class of oxygen ion mixed conductors." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for kjemisk prosessteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26129.

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Dense ceramic membranes with mixed ionic and electronic conductivity can separate 100 % pure oxygen from air at elevated temperature. They constitute a much cheaper and more environmentally friendly alternative to cryogenic distillation. Today the challenge with dense ceramic membranes is the long term stability. The high operating temperatures (>800°C) of the membranes lead to chemical degradation and mechanical failure. Hexagonal manganites has the ability to reduce the problems associated with high temperatures. Compared to perovskites, which conduct through formation of oxygen vacancies, hexagonal manganites have the ability to form interstitial oxygen due to a less closed packed structure. In this thesis, it is reported on how the structure and oxygen storage ability changes with varying yttrium deficiency in hexagonal YMnO3. It is important to investigate the possibility of cation vacancies in the structure, as little is known about the defect chemistry of these materials. Yttrium deficient samples of YMnO3 made by solid state synthesis was fired in air, and annealed in varying atmospheres. Hexagonal YMnO3 has the ability to lose 15-20 % yttrium without any notable changes in the structure and composition of yttrium deficient YMnO3. Above this limit, reflections from Mn3O4 hausmannite appears in x-ray diffractograms. With a higher degree of yttrium deficiency in the hexagonal structure prepared in air, a slight contraction of the unit cell along both a and c direction is found. After annealing in O2 atmosphere, the structure expands along the a axis and contracts along the c-axis. The opposite behavior is seen in inert (N2) atmosphere, where the structure expands in c direction and contract along the a axis with increased yttrium deficiency in YMnO3. Above 600 ˚C, during heating of YMnO3 and Y0.80MnO3, oxygen goes out of the materials in both N2 and O2 atmospheres. Upon cooling in O2 atmosphere, a reversible oxygen uptake is seen around 400 ˚C for both YMnO3 and yttrium deficient YMnO3. For stoichiometric YMnO3 the reversible oxygen adsorption is suggested to be attributed to interstitial oxygen, while for stoichiometric yttrium deficient YMnO3 it is believed to be filling of oxygen vacancies. The reversible oxygen uptake of YMnO3 was calculated to be δ= 0.034. Moreover, in this thesis it is also reported on the synthesis of an asymmetric membrane consisting of 15 % titanium substituted YMnO3. The asymmetric membrane did not yield a dense functional layer of nanocrystalline YMn0.85Ti0.15O3 on top of the porous support after sintering.
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5

Bu, Junfu. "Advanced BaZrO3-BaCeO3 Based Proton Conductors Used for Intermediate Temperature Solid Oxide Fuel Cells (ITSOFCs)." Doctoral thesis, KTH, Tillämpad processmetallurgi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-165073.

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In this thesis, the focus is on studying BaZrO3-BaCeO3 based proton conductors due to that they represent very promising proton conductors to be used for Intermediate Temperature Solid Oxide Fuel Cells (ITSOFCs). Here, dense BaZr0.5Ce0.3Y0.2O3-δ (BZCY532) ceramics were selected as the major studied materials. These ceramics were prepared by different sintering methods and doping strategies. Based on achieved results, the thesis work can simply be divided into the following parts: 1) An improved synthesis method, which included a water-based milling procedure followed by a freeze-drying post-processing, was presented. A lowered calcination and sintering temperature for a Hf0.7Y0.3O2-δ (YSH) compound was achieved. The value of the relative density in this work was higher than previously reported data. It is also concluded that this improved method can be used for mass-production of ceramics. 2) As the solid-state reactive sintering (SSRS) represent a cost-effective sintering method, the sintering behaviors of proton conductors BaZrxCe0.8-xLn0.2O3-δ (x = 0.8, 0.5, 0.1; Ln = Y, Sm, Gd, Dy) during the SSRS process were investigated. According to the obtained results, it was found that the sintering temperature will decrease, when the Ce content increases from 0 (BZCLn802) to 0.3 (BZCLn532) and 0.7 (BZCLn172). Moreover, the radii of the dopant ions similar to the radii of Zr4+ or Ce4+ ions show a better sinterability. This means that it is possible to obtain dense ceramics at a lower temperature. Moreover, the conductivities of dense BZCLn532 ceramics were determined. The conductivity data indicate that dense BZCY532 ceramics are good candidates as either oxygen ion conductors or proton conductors used for ITSOFCs. 3) The effect of NiO on the sintering behaviors, morphologies and conductivities of BZCY532 based electrolytes were systematically investigated. According to the achieved results, it can be concluded that the dense BZCY532B ceramics (NiO was added during ball-milling before a powder mixture calcination) show an enhanced oxygen and proton conductivity. Also, that BZCY532A (NiO was added after a powder mixture calcination) and BZCY532N (No NiO was added in the whole preparation procedures) showed lower values. In addition, dense BZCY532B and BZCY532N ceramics showed only small electronic conductivities, when the testing temperature was lower than 800 ℃. However, the BZCY532A ceramics revealed an obvious electronic conduction, when they were tested in the range of 600 ℃ to 800 ℃. Therefore, it is preferable to add the NiO powder during the BZCY532 powder preparation, which can lower the sintering temperature and also increase the conductivity. 4) Dense BZCY532 ceramics were successfully prepared by using the Spark Plasma Sintering (SPS) method at a temperature of 1350 ℃ with a holding time of 5 min. It was found that a lower sintering temperature (< 1400 ℃) and a very fast cooling rate (> 200 ℃/min) are two key parameters to prepare dense BZCY532 ceramics. These results confirm that the SPS technique represents a feasible and cost-effective sintering method to prepare dense Ce-containing BaZrO3-BaCeO3 based proton conductors. 5) Finally, a preliminary study for preparation of Ce0.8Sm0.2O2-δ (SDC) and BZCY532 basedcomposite electrolytes was carried out. The novel SDC-BZCY532 based composite electrolytes were prepared by using the powder mixing and co-sintering method. The sintering behaviors, morphologies and ionic conductivities of the composite electrolytes were investigated. The obtained results show that the composite electrolyte with a composition of 60SDC-40BZCY532 has the highest conductivity. In contrast, the composite electrolyte with a composition of 40SDC-60BZCY532 shows the lowest conductivity. In summary, the results show that BaZrO3-BaCeO3 based proton-conducting ceramic materials represent very promising materials for future ITSOFCs electrolyte applications.

QC 20150423

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6

Al-Musa, Abdullah Abdulaziz. "Partial oxidation of propene using solid electrolyte membrane reactors." Thesis, Loughborough University, 2002. https://dspace.lboro.ac.uk/2134/6915.

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This study investigates the efficiency of a calcia stabilised zirconia (CaSZ) solid electrolyte as an oxygen ion conductor. The study also examines the behaviour of the oxygen species conducted by the solid electrolyte compared to species provided in the gas phase for partial oxidation of hydrocarbons. In this work, an electrochemical cell of the form Air, AgHCaSZ//Ag, Carrier gas was used to investigate the electrochemical efficiency and stability of the solid electrolyte CaSZ conducting of oxygen ions under atmospheric pressure conditions at 500 degrees C by applying a range of electrical potentials from I to 16 volts across the electrochemical cell. Due to the applied potential oxygen anions are transferred across the solid electrolyte from the cathode side of the cell to the anode side. It was found that the employed electrolyte is approximately a 100% purely ionic conductor of oxygen ions in the range of electrical voltage applied from I to 10 volts. Above that range the cell started to degrade and loose its ionic efficiency. It was possible to generate gas mixtures containing trace quantities of oxygen. The viscosity of these gas mixtures as a function of oxygen concentration was determined using an established flow perturbation technique (Flux Response Technology). Partial oxidation of propene was used to investigate the difference between the oxygen species produced electrochemically via electrical potential application across the electrochemical cell Air, AgHCaSZ//Ag, Propene, Ar and oxygen provided in the gaseous state co-fed with propene over silver electrode under atmospheric pressure and 450 degrees C and 500 degrees C. It was found that the method of electrochemical provision of oxygen caused the silver catalyst to be more selective to 1,5-hexadeine, whereas the gaseous oxygen provision produced acrolein as the major product. Carbon dioxide formation was not affected by the method of oxygen provision. The Ag electrode was compared to an Au-rich Ag alloy electrode for propene partial oxidation using electrochemical provision. It was found that 1,5-hexadiene was the major product over both electrodes, but the Au-rich alloy was more selective for acrolein than the Ag electrode. This might be due to the gold serving as a separator between Ag particles which hinder the back-spill over of oxygen and allow desorption of molecular oxygen in the gas phase, which then re-adsorb molecularly on silver sites producing acrolein. The effect of the sequence of the method of oxygen provision on the partial oxidation of propene was tested using the electrochemical cell Y-BiMoHAg//CaSZ//Ag at 450 degrees C and atmospheric pressure. A sharp decrease in acrolein selectivity was found when oxygen was provided in the gas phase after treatment with electrochemical oxygen, while no significant effect was noticed when the electrochemical oxygen was used after treatment with gaseous oxygen. This large decrease in acrolein selectivity might be attributed to the severe reduction of the catalyst, which is probably caused by high electrical potential application. A temperature increase from 450 to 500 degrees C seemed to suppress the formation of acrolein for both methods of oxygen provision and enhance the 1,5-hexadiene formation.
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7

Martins, Rodrigues Ana Candida. "Synthèse et propriétés électriques de verres oxydes conducteurs par ion lithium." Grenoble INPG, 1988. http://www.theses.fr/1988INPG0010.

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L'etude porte sur la variation de la conductivite electrique des systemes borotellurates et borophosphates suivants : lio::(2)-b::(2)o::(3)-te::(2)o::(4) et li::(2)o-b::(2)o::(3)-p::(2)o::(6)-lix (x=f, cl, br). L'effet de formateur mixte pour le premier systeme et l'effet de sel dopant dans le second systeme ont ete interpretes a l'aide de la theorie de l'electrolyte faible et d'un modele de solutions regulieres
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8

Martins-Rodrigues, Ana Candida. "Synthèse et propriétés électriques de verres oxydes conducteurs par ion lithium." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37615911x.

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9

Corallini, Serena. "Structure and dynamics of a new Brownmillerite compound Sr₂₋ₓBaₓScGaO₅ in view of possible application as oxygen ion electrolite at moderate temperature". Thesis, Rennes 1, 2013. http://www.theses.fr/2013REN1S172.

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Les conducteurs d'ions oxygène fonctionnant à des températures inférieures à 300 ° C sont des matériaux d'intérêt majeur pour une série d’applications technologiques telles que les piles à combustible solide, les batteries, les électrodes, les capteurs, des catalyseurs, etc. Cependant à l’heure actuelle, les conducteurs d'ions d'oxygène solides fonctionnent raisonnablement seulement à haute température, supérieure à 800°C, ce qui limite leur application. Dans la recherche de l'amélioration des conducteurs d'ions d'oxygène, la structure Brownmillérite (ABO2.5 éq. A2B2O5) a toujours joué un rôle important, en particulier dans le régime à basse température où la dynamique de la chaîne tétraédrique induit la mobilité de l'oxygène. Dans ce contexte, nous avons synthétisé une nouvelle phase Sr2-xBaxScGaO5 (avec x=0 SSGO et x= 0.1 SBSGO), contenant des ions 3d0 diamagnétiques et susceptible d’être un conducteur ionique pur. En fonction de la voie de synthèse, le composé présente deux polymorphes, orthorhombiques et cubiques, qui sont tous deux importants pour la conductivité de l'oxygène. La réaction à l’état solide conduit à une structure de type Brownmillerite orthorhombique tandis que la synthèse de fusion de zone (FTZ) donne une structure Pérovskite déficitaire en oxygène .Par diffraction neutronique sur poudre (D2B @ ILL) nous avons analysé la structure des deux polymorphes, en fonction de la température. Une analyse détaillée du type SSGO Brownmillerite montre que le Sc occupe les sites octaédriques, tandis que Ga occupe exclusivement les tétraèdres autres. Cet ordre de cations est assez inhabituel pour les structures de type Brownmillerite. La deuxième particularité est que Sr2-xBaxScGaO5 subit une transition de phase à partir d'une configuration ordonnée des chaines (GaO4), caractéristiques du groupe d’espace I2mb à température ambiante, vers une configuration désordonnée des chaînes dans le groupe d’espace Imma (à 500°C). Ce résultat important confirme notre hypothèse que le désordre est dynamique et il est la clé pour avoir un conducteur d'ions d'oxygène à températures modérées. La synthèse à des températures élevées (jusqu'à fusion), donne une structure cubique Pm ̅m, stable jusqu'à 1000 ° C. La structure est de type Pérovskite fortement déficitaire en oxygène. La mobilité de l’oxygène de ces nouveaux composés a été ensuite étudiée par la thermogravimétrie (TGA) couplée avec spectroscopie de masse (MS) après échange isotopique 18O-16O, par spectroscopie RAMAN et RMN couplée avec les calculs théoriques ab-initio (WIEN2k), par diffusion inélastique des neutrons (IN6@ILL) couplée avec des calculs de dynamiques moléculaire ab-initio (VASP). Les résultats obtenus via les études structurales et de dynamique de réseau montrent que l’activation de la mobilité ionique est liée à la transition vers la structure désordonnée Imma, qui implique une dynamique importante des chaines GaO4 et une diffusion unidimensionnel le long des canaux lacunaires. Ces résultats ont pu être reproduits par calculs de dynamique moléculaire, dans lesquels la diffusion ne concerne que les oxygènes des plans tétraédriques, et s’expliquent par des paramètres de maille a et c qui sont significativement augmentés par rapport à (Ca/Sr)FeO2.5
Oxygen ion conductors operating at low temperature, below 300 ° C, are materials of major interest for several applications in the area of solid state ionicsas solid fuel cells, batteries, electrodes, sensors, catalysts, etc. However till now, the solid oxygen ion conductor works reasonably only at high temperatures above 800 ° C, which limits their application. In the search for improved oxygen ion conductors Brownmillerite structures ( ABO2.5 eq. A2B2O5 ) has always played an important role, especially in the low temperature regime where the dynamics of the tetrahedral chain induced mobility of oxygen. In this context, we have synthesized a new phase Sr1-xBaxScGaO5 with x = 0 (SSGO) and x = 0.1 (SBSGO) containing diamagnetic 3d0 ions to have a pure ion conductor. Depending on the synthesis route, the compound has two polymorphs, orthorhombic and cubic, which are both important for the oxygen conductivity. The reaction in the solid state leads to an orthorhombic Brownmillerite-type structure, while tmeling synthesis (using the Travelling Floating Zone method FTZ ) gives an oxygen-deficient Perovskite structure. The structures of both polymorphs were analyzed using the neutron powder diffraction as function of the temperature (D2B@ILL). A detailed analysis of SSGO Brownmillerite type shows that the Sc occupies octahedral sites, while the Ga occupies exclusively the tetrahedral ones. This cation ordering is unusual for the Brownmillerite structures. Moreover Sr2-xBaxScGaO5 undergoes a phase transition from an ordered configuration of the tetrahedral chains (GaO4) characteristic of I2mb space-group at room temperature, toward a disordered one characteristic of Imma space group (500 ° C). This important result confirms that the disorder of the tetrahedral chains is dynamic and it is the key to have oxygen ion conductor at moderate temperatures. Synthesis at elevated temperatures (up to melting point) gives a cubic structure Pm ̅m, stable up to 1000 ° C. The Perovskite -type structure is highly oxygen deficient. The mobility of the oxygen of these new compounds was studied by thermogravimetry analysis (TGA) coupled with mass spectrometry (MS) after the isotope exchange 18O-16O, by Raman and NMR spectroscopy coupled with theoretical ab-initio calculations (WIEN2k), by inelastic neutron scattering (IN6@ILL) coupled with calculations of ab-initio molecular dynamics (VASP ) . The results obtained from the structural and the lattice dynamics studies show that activation of the ion mobility is related to the transition to a disordered structure Imma, which implies an important dynamics of the chains GaO4 and the diffusion along the one-dimensional vacancy channel. These results have been reproduced by molecular dynamics calculations, in which the diffusion pathway is due only to the oxygen in the tetrahedral planes
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10

Chesnaud, Anthony. "Oxy-gallates et oxy-germanates de terres rares conducteurs par ions oxygène." Nantes, 2005. http://www.theses.fr/2005NANT2047.

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De nouveaux conducteurs anioniques dérivés de Nd4Ga2O9, Nd4GeO8 et Nd3GaO6, ont été obtenus par substitutions cationiques. Les oxy-Cuspidine Nd4[Ga2(1-x)M2xO7+xٱ1-x]O2 (M=Ge,Ti) ont été préparées par diverses techniques. Avec la substitution, la structure Cuspidine est maintenue jusqu'à x=0,5 et 1,0 pour M=Ge et Ti respectivement. Dans les deux cas, une modulation 1D de la structure est observée pour x  0,15 mais l'effet du substituant sur la conductivité anionique est différent : Ti joue un rôle assez neutre alors que Ge l'améliore. De nouveaux composés ont aussi été préparés par substitution de Ge4+ par Ga3+ dans Nd4GeO8, de Ga3+ par Zn2+, Mg2+, et de Nd3+ par Ca2+, Sr2+ dans Nd3GaO6. Une technique d'auto-combustion a été développée pour synthétiser ces matériaux à 900°C. Il est possible de créer 10% de lacunes d'oxygène dans Nd4GeO8 et moins de 1% dans Nd3GaO6. Cependant, ces taux de substitution relativement faibles induisent une nette augmentation de la conductivité.
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Книги з теми "Oxygen Ion Conductors"

1

H, Steele B. C., and Institute of Materials, eds. Ceramic oxygen ion conductors and their technological applications. London: Institute of Materials, 1996.

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2

Tuller, Harry L., Johannes Schoonman, and Ilan Riess, eds. Oxygen Ion and Mixed Conductors and their Technological Applications. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-2521-7.

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3

Steele, B. C. H. Matsci: Ceramic Oxygen Ion Conductors and Their Technological Applications. Taylor & Francis Group, 1996.

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4

Schoonman, Joop, H. L. Tuller, and Ilan Riess. Oxygen Ion and Mixed Conductors and their Technological Applications. Springer, 2011.

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5

(Editor), H. L. Tuller, Joop Schoonman (Editor), and Ilan Riess (Editor), eds. Oxygen Ion and Mixed Conductors and their Technological Applications (NATO Science Series E:). Springer, 2000.

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6

(Editor), Harry L. Tuller, Johannes Schoonman (Editor), and Ilan Riess (Editor), eds. Oxygen Ion and Mixed Conductors and Their Technological Applications: Proceedings of the NATO Advanced Study Institute, Held in Erice, Sicily, Italy, 15-30 ... Series. Series E, Applied Sciences, Vol 368). Kluwer Academic Pub, 2004.

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Частини книг з теми "Oxygen Ion Conductors"

1

Steele, B. C. H. "Dense Ceramic Ion Conducting Membranes." In Oxygen Ion and Mixed Conductors and their Technological Applications, 323–45. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-2521-7_10.

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2

Boukamp, B. A., I. C. Vinke, K. J. Vries, and A. J. Burggraaf. "Surface Oxygen Exchange Kinetics of Solid Oxide Ion Conductors." In Fast Ion Transport in Solids, 167–80. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1916-0_9.

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3

Riess, I. "Solid State Electrochemical Cells." In Oxygen Ion and Mixed Conductors and their Technological Applications, 1–20. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-2521-7_1.

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4

Bieberle, A., and L. J. Gauckler. "Thermal and Isothermal Expansion." In Oxygen Ion and Mixed Conductors and their Technological Applications, 347–58. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-2521-7_11.

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5

Kleinlogel, C., and L. J. Gauckler. "Temperature Limitations in the Processing Sequence of Solid Oxide Fuel Cells." In Oxygen Ion and Mixed Conductors and their Technological Applications, 359–74. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-2521-7_12.

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Bieberle, A., and L. J. Gauckler. "Metallic Interconnector." In Oxygen Ion and Mixed Conductors and their Technological Applications, 375–87. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-2521-7_13.

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7

Bieberle, A., and L. J. Gauckler. "Glass Seals." In Oxygen Ion and Mixed Conductors and their Technological Applications, 389–97. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-2521-7_14.

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8

Maier, Joachim. "Electrochemical Sensors." In Oxygen Ion and Mixed Conductors and their Technological Applications, 399–421. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-2521-7_15.

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9

Steele, B. C. H. "Solid Oxide Fuel Cells." In Oxygen Ion and Mixed Conductors and their Technological Applications, 423–47. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-2521-7_16.

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10

Mogensen, Mogens. "Comparison of Solid Oxide Fuel Cells with Alternative Fuel Cells and Competitive Technologies." In Oxygen Ion and Mixed Conductors and their Technological Applications, 449–69. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-2521-7_17.

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Тези доповідей конференцій з теми "Oxygen Ion Conductors"

1

Anirban, Sk, and A. Dutta. "Charge carrier dynamics in nanocrystalline Dy substituted ceria based oxygen ion conductors." In INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2015): Proceeding of International Conference on Condensed Matter and Applied Physics. Author(s), 2016. http://dx.doi.org/10.1063/1.4946121.

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2

Salazar-Villalpando, Maria D., David A. Berry, Dushyant Shekhawat, Todd H. Gardner, and Ismail Celik. "Synthesis Gas by Partial Oxidation and the Role of Oxygen-Conducting Supports: A Review." In ASME 2004 2nd International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2004. http://dx.doi.org/10.1115/fuelcell2004-2539.

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The objective of this review is to bring together results from experimental studies to better understand issues and the role of catalyst types and supports in the conversion of hydrocarbon fuels to synthesis gas. Fuel conversion, selectivity and carbon formation as function of type of support, metal, dispersion and temperature are presented. Reaction mechanisms for syn-gas (a mixture of CO and H2) production and formation of inactive carbon are reviewed. This review resulted in two primary conclusions: 1) Catalyst supports based on oxygen-ion conductors such as doped ceria may be used to mitigate carbon formation due to their high oxygen mobility; and 2) A more detailed and comprehensive study of these systems leading to mechanistic understanding may be of significant benefit in developing low-cost, effective, and long-duration reforming catalysts for POM and possibly higher hydrocarbon fuels.
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3

Takamura, Hitoshi, Yusuke Aizumi, Atsunori Kamegawa, and Masuo Okada. "Hydrogen Production From Methane by Using Oxygen Permeable Ceramics." In ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2005. http://dx.doi.org/10.1115/fuelcell2005-74173.

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Oxygen permeable ceramics based on mixed conductors are attracting much attention for use in partial oxidation of hydrocarbons as a novel technique for syngas and pure hydrogen production. This paper describes the preparation and oxygen permeation properties including methane reforming property of a novel member of oxygen permeable ceramics. The materials used are solid solutions of (La0.5Ba0.3Sr0.2)(FexIn1−x)O3−δ. The single phase of perovskite-type (La0.5Ba0.3Sr0.2)(FexIn1−x)O3−δ is obtained in the range of x = 0.4 to 0.9. The highest oxygen flux densities of 2.2 and 11 μmol/cm 2 s are attained for (La0.5Ba0.3Sr0.2)(FexIn1−x)O3−δ (x = 0.6) at 1000 °C under He / air and CH4 / air gradients, respectively. The electrical conductivity of (La0.5Ba0.3Sr0.2)(Fe0.6 In0.4)O3−δ is dominated by p-type conduction having a slope of 1/4 under the high P(O2) region. The oxide-ion conductivity of the same sample is estimated to be 0.05 S/cm at 800°C. Even though the oxygen flux density slightly decreases with increasing time, high CO selectivity of 90 % is kept for 100 h. The oxygen flux density of the solid solution is also discussed in the context of surface exchange kinetics.
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4

Guler, Mehmet Oguz, Mirac Alaf, Deniz Gultekin, Hatem Akbulut, and Ahmet Alp. "The Effect of Pressure on the Microstructural Behavior on SnO2 Thin Films Deposited by RF Sputtering." In ASME 2008 2nd Multifunctional Nanocomposites and Nanomaterials International Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/mn2008-47071.

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Tin oxide has multiple technological applications including Li-ion batteries, gas sensors, optoelectronic devices, transparent conductors and solar cells. In this study tin dioxide (SnO2) thin films were deposited on glass substrates by RF sputtering process in the oxygen (O2) and argon (Ar) plasma medium. The deposition of the thin SnO2 films was carried out by RF sputtering from SnO2 targets. Before deposition the system was evacuated to 10−4 torr vacuum level and backfilled with Ar. The deposition of the nano structured thin SnO2 films have been performed at different gas pressures. The deposition of the SnO2 was both carried out at different pure argon gas pressures and argon/oxygen mediums with varying oxygen partial pressures. The effect of argon and argon/oxygen partial gas pressures on the grain structure and film thickness were analyzed in the resultant thin films. The deposited thin films both on glass and stainless steel substrates were characterized with scanning electron microscopy (SEM), X-ray diffractometry equipped with multi purpose attachment. The grain size of the deposited layer was determined by X-ray analysis. The Atomic Force Microscopy (AFM) technique was also conducted on the some selected coatings to reveal grain structure and growth behaviors.
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5

Zhu, Bin. "Advanced Ceramic Fuel Cell R&D." In ASME 2004 2nd International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2004. http://dx.doi.org/10.1115/fuelcell2004-2499.

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Since many years in Swedish national research project and Swedish-Chinese research framework we have carried out advanced ceramic fuel cell research and development, targeting for intermediate and low temperature ceramic or solid oxide fuel cells (ILTCFCs or ILTSOFCs, 300–700°C) based on ceramic-based composite materials. The ceramic composite material developments in Sweden have been experienced from the oxyacid-salts oxide proton-based conductors, non-oxide containment salts, the ceria-based composite electrolytes and nano-composites. Among them the ceria-based composites showed excellent ionic conductivity of 0.01 to 1 Scm−1 and ILTCFCs using these composites as electrolytes have achieved high performances of 200 to 1000 mWcm−2 at temperatures between 400 and 700°C. The excellent ion conduction was resulted from hybrid proton and oxygen ion conduction. The hybrid ion conduction and dual electrode reactions and processes create a new fuel cell system. Advanced ceramic fuel cell aims at developing a new generation to realize the challenges for fuel cell commercialization. This paper reviews our more than 14 years R&D on the field with emphasis on the recent progresses and achievements.
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6

Baek, Seung-Wook, Joongmyeon Bae та Jung Hyun Kim. "Oxygen Reduction Mechanism at Sm0.5Sr0.5CoO3−δ/Sm0.2Ce0.8O1.9 Composite Cathode for Solid Oxide Fuel Cell". У ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/fuelcell2008-65059.

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The oxygen reduction mechanism at porous Sm0.5Sr0.5CoO3−δ/Sm0.2Ce0.8O1.9 composite cathode, in which Sm0.5Sr0.5CoO3−δ is a perovskite type mixed ionic and electronic conductor (MIEC), was studied with respect to the oxygen partial pressure and temperature. Symmetric half cells with Sm0.2Ce0.8O1.9 electrolyte were prepared, and cathode behavior was measured by using electrochemical impedance spectroscopy at frequency range of 0.1Hz∼5MHz and temperature range of 400∼900°C. Oxygen partial pressure range for the measurement was from 0.0002 to 1atm. In present research, reaction model based on the empirical equivalent circuit was established. Three elementary reaction steps were considered to describe the oxygen reduction reaction at Sm0.5Sr0.5CoO3−δ/Sm0.2Ce0.8O1.9 composite cathode. Electrode resistances corresponding to the high and low frequency seem to represent the oxygen ion transfer at the interface of electrolyte and gas phase diffusion of oxygen, respectively, from electrochemical impedance analyses as functions of oxygen partial pressure and temperature. The medium frequency process is expected to correspond to the oxygen ion conduction in the bulk cathode from this study.
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7

Idrus, L. H., A. K. Yahya, Swee-Ping Chia, Kurunathan Ratnavelu, and Muhamad Rasat Muhamad. "Resistance-Based Ceramic Ho123 Ionic Conductor for Oxygen Gas Sensing." In FRONTIERS IN PHYSICS: 3rd International Meeting. AIP, 2009. http://dx.doi.org/10.1063/1.3192242.

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8

Bonneau, M., F. Gitzhofer, and M. Boulos. "SOFC/CeO2 Doped Electrolyte Deposition Using Suspension Plasma Spraying." In ITSC 2000, edited by Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0929.

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Abstract Ceria (CeO2) based electrolytes have been considered for use in solid oxide fuel cells (SOFC) for more than 20 years. There are however some limitations to this usage that this study has tried to address, indeed the study objective has been that of synthesizing and thermal spraying thin layers (50 - 100 µm) of doped CeO2 by the technique of suspension plasma spraying, using radio frequency (RF) plasma technology. Various dopant combinations and concentrations have been selected for this work in order to increase the useful partial oxygen pressure range for satisfactory ionic conductivity development, thereby increasing the anionic conductivity and preventing CeO2 reduction in fuel cell service. Ceria possesses the fluorite crystal structure at low temperatures but does not have enough oxygen vacancies to be a good ionic conductor. In ceria the cerium have 4+ oxidation state within the fluorite structure, and by substituting a certain amount of Ce4+ ions by trivalent dopant ions, oxygen vacancies are induced into the structure. Recent studies have demonstrated that at low temperatures doped ceria seems to be a better electrolyte than doped zirconia. Also, it seems that dopants with ionic radii close to Ce4+ ions give rise to better ionic conductivities. The doped ceria conductivity increases with the dopant concentration because more oxygen vacancies are created, but at higher concentrations vacancy ordering occurs which results in decreased ionic conductivity.
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9

Lee, R. A., and T. R. Lundquist. "Low Resistivity FIB Depositions Within High Aspect Ratio Holes." In ISTFA 1996. ASM International, 1996. http://dx.doi.org/10.31399/asm.cp.istfa1996p0085.

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Abstract The latest IC modification requirement is to decrease the resistivity of Focused Ion Beam (FIB) deposits, especially deposits within a FIB machined hole. The resistivity of platinum conductor deposited by FIB within a hole is much greater (5000-50000 (μΩ-cm) than that deposited on a surface (~200 |μΩ-cm) (1). Auger analysis of surface deposited platinum conductor gives the composition ratios as ~ 50% platinum, ~34% carbon, ~15% gallium and ~1 % Oxygen. The escape solid angle of the organic carrier is much less from a hole than from a surface; therefore, we find more of the non-conductive organic material is trapped inside the hole which increases the fill resistivity. With its planarization and multiple metal levels, advanced IC process technology forces contact to lower level metal to be through high aspect ratio holes. To make a low resistance contact through such a hole, deposited material must have a high ratio of platinum to carbon and Oxygen. An improved technique is needed to remove the organic carrier molecules and deposit material containing this higher platinum percentage. The way to achieve such deposition is to adjust gas arrival rate and beam current to produce a deposition rate that allows sufficient time for the organic carrier molecules to escape. Using this method, we can to obtain fill resistivity of about 1000-2500 (μΩ-cm within high aspect ratio holes. This paper discusses in detail the technique to achieve such low resistivity in high aspect ratio holes. On the surface where space is not so limited, a greater deposition rate yields shorter times to resistance as well as better step coverage, but within a hole a lower resistivity material is needed to result in good conductance to lower level metal.
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10

Brousse, E., G. Montavon, A. Denoirjean, P. Fauchais, and K. Wittmann-Teneze. "Gastight Yttria-Partially Stabilized Zirconia Layers Manufactured by Suspension Plasma Spraying for SOFC Electrolyte Functional Layers." In ITSC2009, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. ASM International, 2009. http://dx.doi.org/10.31399/asm.cp.itsc2009p0120.

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Abstract Intermediate temperature solid oxide fuel cells include in their design a solid electrolyte layer, usually made of yttria-stabilized zirconia, that acts as an ionic conductor through which oxygen ions diffuse. This layer must be as thin as possible to limit ohmic losses yet have a low leakage rate corresponding to a low level of connected stacking defects such as microcracks. Suspension plasma spraying (SPS) appears to be a viable method for manufacturing such layers and is used in this study to produce gastight coatings that with further improvements may meet the requirements of SOFCs. The paper describes the setup and optimization of the SPS process and the methods used to evaluate the solid electrolyte layers.
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Звіти організацій з теми "Oxygen Ion Conductors"

1

Virkar, Anil. Thermodynamic, Kinetic and Electrochemical Studies on Mixed Proton, Oxygen Ion and Electron (Hole) Conductors. Office of Scientific and Technical Information (OSTI), April 2022. http://dx.doi.org/10.2172/1864586.

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