Structural Order-Disorder and Ionic Conductivity of Novel Hexagonal Perovskite-Related Oxides
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Beschreibung
This thesis presents relationships between ionic conductivity and crystal structure of hexagonal perovskite revealed from a new perspective: order and disorder. It describes three state-of-art research results in the new area of structure of ionic conductors, hexagonal perovskite-related structures, based on a new viewpoint of structural order/disorder. The first is occupational disorder of oxygen atoms and ionic conductivity in Ba3MNbO8.5 (M = Mo, W) investigated by high-temperature neutron diffraction and the maximum-entropy method. Second is the hidden chemical order in disordered Ba7Nb4MoO20·0.15H2O that was discovered by a combined technique of resonant X-ray diffraction and solid-state nuclear magnetic resonance. This combined technique was named as RXRD/NMR method. The third is the discovery of a rubidium-containing oxide-ion conductor with large positional disorder of oxygen atoms. This volume gives readers two outlooks. One is proposed guidelines for the search and development of ionic conductors with hexagonal perovskite-related structures. Another is future application of analyses for order/disorder used in this study, especially the RXRD/NMR method.
This thesis presents relationships between ionic conductivity and crystal structure of hexagonal perovskite revealed from a new perspective: order and disorder. It describes three state-of-art research results in the new area of structure of ionic conductors, hexagonal perovskite-related structures, based on a new viewpoint of structural order/disorder. The first is occupational disorder of oxygen atoms and ionic conductivity in Ba3MNbO8.5 (M = Mo, W) investigated by high-temperature neutron diffraction and the maximum-entropy method. Second is the hidden chemical order in disordered Ba7Nb4MoO20·0.15H2O that was discovered by a combined technique of resonant X-ray diffraction and solid-state nuclear magnetic resonance. This combined technique was named as RXRD/NMR method. The third is the discovery of a rubidium-containing oxide-ion conductor with large positional disorder of oxygen atoms. This volume gives readers two outlooks. One is proposed guidelines for the search and development of ionic conductors with hexagonal perovskite-related structures. Another is future application of analyses for order/disorder used in this study, especially the RXRD/NMR method.
Is nominated by Tokyo Institute of Technology as an outstanding Ph.D. thesis Includes review of previous studies of hexagonal perovskite-related structure Introduces general methods for analyzing structural order/disorder
Autor*in
Yuta Yasui
Themen in »Structural Order-Disorder and Ionic Conductivity of Novel Hexagonal Perovskite-Related Oxides«
structural order and disorder hexagonal perovskite crystal structure ion conduction RXRD/NMR method maximum-entropy method