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Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Cationic vacancies.'
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Journal articles on the topic "Cationic vacancies":
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Fantozzi, Gilbert, E. M. Bourim, and Sh Kazemi. "High Damping in Ferroelectric and Ferrimagnetic Ceramics." Key Engineering Materials 319 (September 2006): 157–66. http://dx.doi.org/10.4028/www.scientific.net/kem.319.157.
High damping materials exhibiting a loss factor higher than 10-2 are generally considered as polymer or metallic materials. But, it will be interesting to consider ferroelectric or ferrimagnetic ceramics, in which internal friction can be due to the motion of ferroelectric or magnetic domains. High level of internal friction can be obtained in these ceramics in a given temperature range. In the case of ferroelectric ceramics, hard ferroelectrics, such as BaTiO3 or PZT, can show some relaxation peaks below the Curie temperature due the motion of domain walls and the interaction between the domain walls and the oxygen vacancies or cationic vacancies. In the case of ferrimagnetic ceramics, some anelastic manifestations due to the ferrimagnetic domain walls appear below the Curie Temperature TC. These peaks are linked to the interaction of domain walls with cation vacancies or cation interstitials or the lattice. Above the Curie temperature, a relaxation mechanism due to the exchange of cations Mn3+ and their vacancies on octahedral sites should occur.
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Crépisson, Céline, Hélène Bureau, Marc Blanchard, Jannick Ingrin, and Etienne Balan. "Theoretical infrared spectrum of partially protonated cationic vacancies in forsterite." European Journal of Mineralogy 26, no. 2 (April 11, 2014): 203–10. http://dx.doi.org/10.1127/0935-1221/2014/0026-2366.
Zhao, Baohuai, Rui Ran, Li Sun, Xingguo Guo, Xiaodong Wu, and Duan Weng. "NO catalytic oxidation over an ultra-large surface area LaMnO3+δ perovskite synthesized by an acid-etching method." RSC Advances 6, no. 74 (2016): 69855–60. http://dx.doi.org/10.1039/c6ra12308b.
After etched by acid solution, abundant cationic vacancies appear in A sites of the perovskite structure, leading to a loose structural framework which may contribute the extra surface area, the formation of oxygen vacancies and Mn4+.
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Zhang, Renpeng, Zhongwei Wang, Yanlong Ma, Yu Yan, and Lijie Qiao. "Effect of Cationic/Anionic Diffusion Dominated Passive Film Growth on Tribocorrosion." Metals 12, no. 5 (May 5, 2022): 798. http://dx.doi.org/10.3390/met12050798.
Tribocorrosion behaviours of nickel(Ni) and (niobium)Nb in sodium sulfate(Na2SO4) solution under potentiodynamic and potentiostatic conditions were studied. Under the potentiodynamic condition, the passivation was early broken, accompanied by a sharp increase in frictional coefficient on Nb. The current was more fluctuant, and larger material loss appeared at the higher potential in the potentiostatic condition. However, these phenomena did not occur for Ni, and it even showed lower material loss at the higher potential in the potentiostatic tribocorrosion test. The differences in tribocorrosion behaviour had a close relationship to the passive film growth mechanism, which decided the passive film/metal interface structure. Nb with anionic diffusion dominated mechanism in passive growth would cause the accumulation of oxygen vacancies at the passive film/metal interface. This may weaken the adhesion between the metal and the passive film. However, with the cationic diffusion dominated passive film growth on Ni, cation vacancies concentrated at the passive film/tribo-film interface, and this did not affect the adhesion between metal and passive film. Ni or other passive elements with the cationic diffusion-dominated mechanism in passive film growth were recommended as the alloying element for improving the tribocorrosion resistance of alloys.
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Liu, Chaofeng, Changkun Zhang, Huanqiao Song, Xihui Nan, Haoyu Fu, and Guozhong Cao. "MnO nanoparticles with cationic vacancies and discrepant crystallinity dispersed into porous carbon for Li-ion capacitors." Journal of Materials Chemistry A 4, no. 9 (2016): 3362–70. http://dx.doi.org/10.1039/c5ta10002j.
Merabet, B., S. Kacimi, A. Mir, M. Azzouz, and A. Zaoui. "Vacancy effects on the electronic structure of MgO compound." Modern Physics Letters B 29, no. 25 (September 20, 2015): 1550147. http://dx.doi.org/10.1142/s021798491550147x.
We have investigated the possibility to find [Formula: see text] ferromagnetism (FM) in the non-stoichiometric [Formula: see text] compound using the full potential linearized augmented plane wave [Formula: see text] method. We have examined the oxygen vacancy effect on the electronic structure of [Formula: see text] compound realizing the 128 atoms supercell. Our calculations predict that the cation vacancies cause the FM in [Formula: see text], where the magnetism is often created by the oxygen atoms nearest neighbors of the Mg vacant site, with a spin magnetic moment of 0.21 [Formula: see text]B/atom. We have reported a strong evidence of the existence of FM at room temperature, as we extended our studies to demonstrate the ability to induce intrinsic magnetic moments in MgO with cationic vacancies (Mg).
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Cortés-Gil, Raquel, José M. Alonso, M. Luisa Ruiz-González, and José M. González-Calbet. "Topotactic Migration of Cationic Vacancies in La1-tMn1-tO3." European Journal of Inorganic Chemistry 2010, no. 22 (June 16, 2010): 3436–40. http://dx.doi.org/10.1002/ejic.201000086.
Caignaert, Vincent, Olivier Perez, Philippe Boullay, Md Motin Seikh, Nahed Sakly, Vincent Hardy, and Bernard Raveau. "Oxygen over stoichiometry in the 2H-perovskite related structure: the route to a large family of cation deficient Ising chain oxides Sr1+y[(Mn1−xCox)1−z□z]O3." Journal of Materials Chemistry C 8, no. 41 (2020): 14559–69. http://dx.doi.org/10.1039/d0tc03880f.
Considering the incommensurability of the Co–Mn spin chain oxides, the concept of oxygen over stoichiometry associated with cationic vacancies is demonstrated and quantified, allowing the design of fragmented Ising chain magnet derivatives.
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Panteix, P. J., I. Julien, P. Abélard, and D. Bernache-Assollant. "Influence of cationic vacancies on the ionic conductivity of oxyapatites." Journal of the European Ceramic Society 28, no. 4 (January 2008): 821–28. http://dx.doi.org/10.1016/j.jeurceramsoc.2007.07.019.
Dissertations / Theses on the topic "Cationic vacancies":
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Sorriaux, Maxime. "Réactivité électrochimique et chimique des matériaux à base d'oxyde de titane avec un liquide ionique chloroaluminé pour batteries à l'aluminium." Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS076.
Les changements sociétaux récents rendent nécessaires le développement de nouveaux systèmes de stockage d'énergie. Selon les prévisions, les batteries lithium-ion cesseront de répondre à la demande globale au cours de la prochaine décennie. Dans ce contexte, le développement de nouvelles technologies de batteries est requis. De ce fait, le travail ici proposé explore le système de batterie à l'aluminium. L'étude porte à la fois sur l'électrolyte et sur les matériaux d'électrode. La chimie des défauts est utilisée pour réaliser l'intercalation de l'ion aluminium dans le matériau d'électrode. En effet, les lacunes cationiques, de la structure de l'oxyde de titane choisi, offrent des sites d'insertion privilégiés pour une grande variété d'ions. Cependant, la durée de vie de la batterie est considérablement réduite en raison des interactions entre le matériau d'électrode et le liquide ionique, utilisé comme électrolyte Societal changes drive the need for new energy storage systems. Forecasts consider that lithium-ion batteries will cease to meet the demand within the next decade. In this regard, the development of new battery technologies is mandatory. That is why, in this work, the aluminium battery system is explored. Investigations are performed on both the electrolyte and the electrode materials. In this study, the aluminium ion intercalation in the electrode material is achieved, using the defect chemistry. Indeed, cationic vacancies within a titanium oxide structure offer favourable insertion sites for a wide variety of ions. However, the battery lifespan is observed to be greatly shortened due to interactions between the electrode material and the ionic liquid used as the electrolyte
Book chapters on the topic "Cationic vacancies":
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Meyer, R., and R. Waser. "New Approach for Boundary Conditions: Space Charge Controlled Concentrations of Cation Vacancies in Donor Doped SrTiO3 for Short Diffusion Length." In Defects and Surface-Induced Effects in Advanced Perovskites, 473–78. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4030-0_50.
Latie, L., G. Villeneuve, Ch Ceos, and P. Hagenmüller. "Influence of Cationic Vacancies on the Mobility of Li+ Ions in Some Cation- Deficient Materials. An NMR Study." In April 1, 475–82. De Gruyter, 1985. http://dx.doi.org/10.1515/9783112494561-012.
Ur Rahman, Jamil, Gul Rahman, and Soonil Lee. "Challenges in Improving Performance of Oxide Thermoelectrics Using Defect Engineering." In Thermoelectricity [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96278.
Oxide thermoelectric materials are considered promising for high-temperature thermoelectric applications in terms of low cost, temperature stability, reversible reaction, and so on. Oxide materials have been intensively studied to suppress the defects and electronic charge carriers for many electronic device applications, but the studies with a high concentration of defects are limited. It desires to improve thermoelectric performance by enhancing its charge transport and lowering its lattice thermal conductivity. For this purpose, here, we modified the stoichiometry of cation and anion vacancies in two different systems to regulate the carrier concentration and explored their thermoelectric properties. Both cation and anion vacancies act as a donor of charge carriers and act as phonon scattering centers, decoupling the electrical conductivity and thermal conductivity.
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Welberry, T. R. "Mullite." In Diffuse X-ray Scattering and Models of Disorder, 142–51. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780198862482.003.0011.
Mullite is an important material since it is a major component of all alumino-silicate ceramics. It has a stability field intermediate in composition between sillimanite Al2SiO5 and alumina Al2O3. Diffuse scattering data display a rich diversity of detail. In order to carry out analysis it was assumed that only the distribution of oxygen vacancies is important and that the shifts of neighbouring cations follow directly from these. Then it was possible to treat the system as a simple disordered mixture of two different molecular motifs and carry out analysis using only the SRO component of the scattering equation. SRO parameters describing the distribution of vacancies could then be extracted from the X-ray data by simple Fourier inversion.
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Welberry, T. R. "Cubic stabilised zirconias." In Diffuse X-ray Scattering and Models of Disorder, 163–73. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780198862482.003.0013.
Cubic stabilised zirconias (CSZs) have an extremely simple average structure (the fluorite CaF2 structure) but they exhibit extremely complex diffuse X-ray diffraction patterns. Y-CSZ is used as a pedagogical example to show how various simulation methods together with knowledge of basic diffraction theory can be used to give insight into this complex diffraction problem. Zr and Y differ in atomic number by only one and their X-ray scattering factors are practically identical. Consequently the observed X-ray patterns are dominated by the displacements of the cations and must therefore be described by scattering components I 2 and higher. A model is developed which involves local ordering of O vacancies with size-effect relaxation of the cations around these defects. Finally the vacancy-ordering model is modified to take into account what is observed in electron diffraction. (132 words)
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Sposito, Garrison. "Soil Particle Surface Charge." In The Chemistry of Soils. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780190630881.003.0011.
Structural charge arises on the surfaces of soil mineral particles in which either cation vacancies or isomorphic substitutions of cations by cations of lower valence occur. The principal minerals bearing structural charge are therefore the micas (Section 2.2), the 2:1 clay minerals (Section 2.3), or the Mn(IV) oxide, birnessite (Section 2.4). These three classes of mineral are all layer type and the cleavage surface on which their structural charge is manifest is a plane of O ions. The plane of O ions on the cleavage surface of a layer-type aluminosilicate is called a siloxane surface.This plane is characterized by hexagonal symmetry in the configuration of its constituent O ions, as shown at the top of Fig. 2.3 and, more explicitly, on the right side of Fig. 2.4, where a portion of the siloxane surface of the micas is depicted. Reactive molecular units on the surfaces of soil particles are termed surface functional groups. The functional group associated with the siloxane surface is the roughly hexagonal (strictly speaking, ditrigonalbecause the hexagonal symmetry is distorted when the tetrahedral sheet is fused to an octahedral sheet to form a layer) cavity formed by six corner-sharing silica tetrahedra. This cavity has a diameter of about 0.26 nm. The reactivity of the siloxane cavity depends on the nature of the electronic charge distribution in the layer structure. If there are no nearby isomorphic cations substitutions to create a negative charge, the O ions bordering the siloxane cavity function as an electron cloud donor that can bind molecules weakly through the van der Waals interaction. These interactions are akin to those underlying the hydrophobic interaction, discussed in Section 3.5, because the O in the siloxane surface can form only very weak hydrogen bonds with water molecules. Therefore, uncharged patches on siloxane surfaces may be considered hydrophobic regions to a certain degree, with, accordingly, an attraction for hydrophobic organic molecules. However, if isomorphic substitution of Al3+ by either Fe2+ or Mg2+ occurs in the octahedral sheet, the resulting structural charge is manifest on the siloxane cavities, as discussed in Section 2.3.
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Mingos, D. M. P. "Crystal defects." In Essentials of Inorganic Chemistry 2. Oxford University Press, 1998. http://dx.doi.org/10.1093/hesc/9780198559184.003.0003.
This chapter investigates crystal defects. The types of defects which are commonly observed can be classified as intrinsic, which are integral to the crystal, and extrinsic, which are created by the insertion of foreign ions into the lattice. The chapter first looks at defects which maintain the same formula (stoichiometry). In an ionic crystalline material, the removal of either a cation or an anion would leave a residual charge on the crystal. If oppositely charged ions are removed in a pairwise fashion, then the crystal stays electroneutral. The two vacancies created in the lattice are described as Schottky defects. Alternatively, an ion may migrate from its regular lattice site into an alternative site in the lattice which is not usually occupied. These defects are described as Frenkel defects. The chapter then considers defects which result in changes in the formula.
Conference papers on the topic "Cationic vacancies":
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Haouari, Cherazade, Lorenzo Stievano, Romain Berthelot, and Damien Dambournet. "Engineering cationic vacancies in nanosized Mo-substituted Fe2O3 towards better electrochemical cationic insertion." In 2nd International Online-Conference on Nanomaterials. Basel, Switzerland: MDPI, 2020. http://dx.doi.org/10.3390/iocn2020-07838.
Ganshin, V. A., and Yuri N. Korkishko. "H:LiNbO3 and H:LiTaO3 waveguides: the kinetic model of proton exchange with cationic vacancies participation." In Guided Wave Optics, edited by Alexander M. Prokhorov and Evgeny M. Zolotov. SPIE, 1993. http://dx.doi.org/10.1117/12.145598.
Huang, Xiao. "Effect of Co-Doping on Microstructure, Thermal and Mechanical Properties of Ternary Zirconia-Based Thermal Barrier Coating Materials." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59007.
7YSZ (yttria stabilized zirconia) was co-doped with metal oxides of different valence, ionic radius and mass in order to investigate microstructural and property changes as a result of co-doping. Mechanical alloying process was used to produce the powder blends which were subsequently sintered at 1500°C for 120 hours. The results from SEM, XRD and DSC showed that the microstructures of the co-doped ternary oxides were affected by the amount of oxygen vacancies in the system, the co-dopant cation radius and mass. Increasing the number of oxygen vacancies by the addition of trivalent co-dopant (Yb2O3 and Sc2O3) as well as the use of larger cations promoted the stabilization of cubic phase. The tetravalent co-dopant (CeO2), on the other hand, had the effect of stabilizing tetragonal phase which may transform into monoclinic phase during cooling, depending on the concentration of tetravalent co-dopant and the mass. Smaller cation mass had the effect of reducing the transformation temperature from tetragonal to monoclinic phase. Pentavalent co-dopants (Nb2O5 and Ta2O5) were found to stabilize the tetragonal phase at high temperature; however, the stability of the tetragonal phase upon cooling was determined by the mass and ionic radius of the co-dopants. Cation clustering was observed during cooling in trivalent oxide co-doped 7YSZ while clustering of trivalent and pentavalent cations in pentavalent co-doped 7YSZ was not detected. Additionally, from the thermal conductivity measurement results, it was found that trivalent oxides exhibited the most significant effect on reducing the thermal conductivity of ternary oxides; this trend was followed by pentavalent co-doping oxides whereas the tetravalent CeO2 co-doped 7YSZ showed marginal effect. A semi-empirical thermal conductivity model was established based on defect cluster model and the predicted room temperature thermal conductivity values were found to be consistent with that measured experimentally. Furthermore, the incorporation of co-dopant oxide in 7YSZ was observed to substantially modify the elastic modulus of the ternary oxides. More specifically, the addition of co-dopant with larger cation radius was found to reduce the elastic modulus of 7YSZ due to the increase in lattice parameter(s).
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Uedono, Akira, Naomichi Takahashi, Ryu Hasunuma, Yosuke Harashima, Yasuteru Shigeta, Zeyuan Ni, Hidefumi Matsui, et al. "Impact of Cation Vacancies on Leakage Current on TiN/ZrO2/TiN Capacitors Studied by Positron Annihilation." In 2022 International Symposium on Semiconductor Manufacturing (ISSM). IEEE, 2022. http://dx.doi.org/10.1109/issm55802.2022.10027133.
