Oxygen Vacancy Ordering Phenomena in the Mixed-Conducting Hexagonal Perovskite Ba7Y2Mn3Ti2O20
Source abstract
Abstract
A 21R-type mixed conducting oxygen-deficient hexagonal perovskite Ba 7 Y 2 Mn 3 Ti 2 O 20 was synthesized and its structure characterized by variable temperature neutron powder diffraction. The structure is characterized by the presence of both BaO 2 and BaO 3 layers. In the oxygen-stoichiometric material, the vacancies are ordered in c‘-BaO 2 layers. Extra oxygen is accommodated by intergrowth of the vacancy-ordered c‘-BaO 2 layers with cubic c-BaO 3- x layers ( x ≅ 1), which have disordered 2/3 oxygen occupancy. This material displays mixed electronic and oxide ionic conduction at high temperature, and the role of the two distinct and partially occupied anion sites within the BaO 2 layers in permitting the oxygen mobility is discussed.
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Research context
OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Advanced Condensed Matter Physics · Microwave Dielectric Ceramics Synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Chemistry, The University of Liverpool, Liverpool L69 7ZD, United Kingdom, and ISIS Facility, CCLRC-Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom
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