Article
Nanoscience & Nanotechnology
Miaomiao Jin, Jilang Miao, Yongfeng Zhang, Marat Khafizov, Kaustubh K. Bawane, Boopathy Kombaiah, Yanwen Zhang, David H. Hurley
Summary: Unfaulting of Frank loops in irradiated fluorite-structured oxides is significant for understanding microstructural evolution. Molecular dynamics simulations reveal the atomistic details of the unfaulting process of interstitial Frank loops in ThO2, which involves the annihilation of stacking faults by co-propagating Shockley partials. The findings provide a fundamental understanding of faulted loops in irradiated ThO2 and could be applicable to other fluorite-structured oxides.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Sara Adeeba Ismail, Lulu Jiang, Peng Zhong, Truls Norby, Donglin Han
Summary: Doping with A(2+) cations enhanced the hydration degree of La2Ce2O7, which may be due to an increased concentration of hydratable oxygen vacancies and the coordination of oxide ions by A(2+) in addition to La3+, while the basicity of different A(2+) cations seemed to be unimportant.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Andrey A. Bukaemskiy, Victor L. Vinograd, Piotr M. Kowalski
Summary: The lattice constant of A(x)B(1-x)O(2-0.5x)V(0.5x) fluorite-type solid solutions is composition-dependent, exhibiting different slopes and intercepts; the effective size of the oxygen vacancy is approximately 11% larger than the radius of the oxygen anion, playing a significant role in understanding the structure-property relationships in this system.
Article
Materials Science, Multidisciplinary
Victor L. Vinograd, Andrey A. Bukaemskiy
Summary: The thermodynamic mixing properties of A(x)B(1-x)O(2-0.5x)V(0.5x) fluorite-type solid solutions are modeled as functions of four parameters, predicting the evolution of cation species with decreasing temperature. The model fits structural and calorimetric data on Zr-based systems and provides insights into ionic conductivity and radiation susceptibility.
Article
Chemistry, Physical
V. I. Nikolaichik, B. P. Sobolev, N. I. Sorokin, A. S. Avilov
Summary: The crystals of fluorite and tysonite phases in the BaF2-LaF3 system were studied using electron diffraction and elemental analysis. Clusters of structural defects and nanoscale ordered crystallites were found in the fluorite crystals, while the tysonite crystals showed significantly higher ionic conductivity. The similarity in defect structures between fluorite and tysonite phases may explain the increase in conductivity.
SOLID STATE IONICS
(2022)
Article
Engineering, Electrical & Electronic
Gene Yang, Mohammad El Loubani, Habib Rostaghi Chalaki, Jiwon Kim, Jong K. Keum, Christopher M. Rouleau, Dongkyu Lee
Summary: Interfacial strain in heteroepitaxial oxide thin films is a powerful tool for discovering properties and recognizing the potential of materials performance. Facilitating ion conduction by interfacial strain in oxide multilayer thin films has always been seen as a highly promising route. However, the effect of interfacial strain on ion transport properties is still controversial. In this study, it is shown that interfacial strain can effectively tune the ionic conductivity in multilayer thin films composed of an ionic conductor Gd-doped CeO2 (GDC) and an insulator RE2O3 (RE = Y and Sm). The findings provide insights into the rational design of fast ion conductors through interface engineering.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Crystallography
Elena A. Sulyanova, Denis N. Karimov, Boris P. Sobolev
Summary: The defect structure of Ba0.69La0.31F2.31 single crystals was studied by X-ray diffraction analysis, revealing that annealing leads to static displacement of main anions, La3+ cations, and aggregation of interstitial fluorine anions and La3+ cations into clusters.
Article
Materials Science, Multidisciplinary
S. N. Shkerin, E. S. Ul'yanova, E. G. Vovkotrub
Summary: Analysis of Raman spectra of zirconia doped with different percentages of ytterbia revealed a correlation between the bands and the laser wavelength used, potentially indicating a defect pyrochlore structure. Changes in local oxygen symmetry around cations were observed upon cooling to room temperature.
INORGANIC MATERIALS
(2021)
Article
Chemistry, Physical
Yajun Yue, Aleksandra Dziegielewska, Man Zhang, Stephen Hull, Franciszek Krok, Richard M. Whiteley, Harold Toms, Marcin Malys, Xuankai Huang, Marcin Krynski, Ping Miao, Haixue Yan, Isaac Abrahams
Summary: The BIMEVOXes are excellent oxide ion conductors at low and intermediate temperatures due to their high conductivity associated with local defect structure. The local structures of two BIMEVOX compositions, Bi2V0.9Ge0.1O5.45 and Bi2V0.95Sn0.05O5.475, were examined using total neutron and X-ray scattering methods, revealing different coordination environments for Ge and Sn at different temperatures.
CHEMISTRY OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Romain Vauchy, Shun Hirooka, Tatsutoshi Murakami
Summary: This study proposes a method to construct the fluorite unit-cell based on the ionic radii of the constitutive species and applies it to analyze the lattice parameter of 24 compounds. The results also indicate that this method is applicable to complex oxide solid-solutions incorporating aliovalent cations.
Article
Chemistry, Inorganic & Nuclear
Gregory Leinders, Gianguido Baldinozzi, Clemens Ritter, Rolando Saniz, Ine Arts, Dirk Lamoen, Marc Verwerft
Summary: The atomic arrangement of the mixed-valence oxide U3O7 was refined using high-resolution neutron scattering data, revealing a long-range structural order and distorted cuboctahedral oxygen clusters. By combining experimental data and electronic structure calculations, researchers demonstrated an interplay between charge localization and magnetic moments carried by uranium atoms, predicting U3O7 to be a semiconducting solid with different insulating behavior compared to UO2. The distribution of valence states includes tetravalent, pentavalent, and hexavalent uranium ions, with noncollinear magnetic moments resulting in canted ferromagnetic order within the overall structure.
INORGANIC CHEMISTRY
(2021)
Article
Physics, Applied
Xiaofan Du, Guoli Lu, Zhipeng Shao, Chengdong Wang, Jun Ma, Jingwen Zhao, Guanglei Cui
Summary: In this study, first-principles density functional theory calculations were used to investigate the electronic structures, mechanical and thermodynamic properties, Li-ion transport, and interfacial behaviors of lithium triborates (LBOs). The results show that LBOs exhibit high ionic conductivity, thermodynamic and mechanical stability, and a stable interface with lithium metal.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Aleksandr Bamburov, Yevgeniy Naumovich, Dmitry D. Khalyavin, Aleksey A. Yaremchenko
Summary: This study investigated the possibility of introducing cation vacancies into the Ln sublattice of perovskite-related Ruddlesden-Popper nickelates. The results showed that the concentration of cation vacancies in the A sublattice of the Ruddlesden-Popper structure is very low, and the introduction of vacancies enhances the diffusivity of A-site cations and destabilizes the structure. However, the nominal cation deficiency has no effect on the electrical conductivity and oxygen permeability of the ceramics.
CHEMISTRY OF MATERIALS
(2023)