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This book reports a study of a class of Dion–Jacobson-type
layered perovskite oxides in which high oxide-ion conductivities in
phases were discovered for the first time in the world. The
oxide-ion conductors are important in various energy conversion
devices and environmental protection applications such as
solid-oxide fuel cells, oxygen gas sensors, oxygen separation
membranes, and oxygen-based catalysts. The discoveries are based on
a new screening method, called the bond valence method, combined
with an original design concept. The present finding of high
oxide-ion conductivity reported in the thesis suggested the
potential of Dion–Jacobson phases as a platform to identify
superior oxide-ion conductors. To understand what causes such high
oxide-ion conductivities in these layered perovskite oxides, the
author analyzed their crystal structures at high temperature and
described the relationship between oxide-ion conductivities and
their crystal structures. A deep understanding of the mechanisms of
oxide-ion diffusivity at an atomic level in the Dion–Jacobson
phases is clarified. The discovery of these materials, the new
screening method, and the original design concept make possible the
realization of many environment-friendly technologies. The findings
in this thesis facilitate the possibilities for many novel
applications that will help lead to a sustainable future.Â
This book reports a study of a class of Dion-Jacobson-type layered
perovskite oxides in which high oxide-ion conductivities in phases
were discovered for the first time in the world. The oxide-ion
conductors are important in various energy conversion devices and
environmental protection applications such as solid-oxide fuel
cells, oxygen gas sensors, oxygen separation membranes, and
oxygen-based catalysts. The discoveries are based on a new
screening method, called the bond valence method, combined with an
original design concept. The present finding of high oxide-ion
conductivity reported in the thesis suggested the potential of
Dion-Jacobson phases as a platform to identify superior oxide-ion
conductors. To understand what causes such high oxide-ion
conductivities in these layered perovskite oxides, the author
analyzed their crystal structures at high temperature and described
the relationship between oxide-ion conductivities and their crystal
structures. A deep understanding of the mechanisms of oxide-ion
diffusivity at an atomic level in the Dion-Jacobson phases is
clarified. The discovery of these materials, the new screening
method, and the original design concept make possible the
realization of many environment-friendly technologies. The findings
in this thesis facilitate the possibilities for many novel
applications that will help lead to a sustainable future.
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