Electron diffraction study of the sillenites Bi12SiO20, Bi25FeO39 and Bi25InO39: Evidence of short-range ordering of oxygen-vacancies in the trivalent sillenites
Source abstract
Abstract
We present an electron diffraction study of three sillenites, Bi12SiO20, Bi25FeO39, and Bi25InO39 synthesized using the solid-state method. We explore a hypothesis, inspired by optical studies in the literature, that suggests that trivalent sillenites have additional disorder not present in the tetravalent compounds. Electron diffraction patterns of Bi25FeO39 and Bi25InO39 show streaks that confirm deviations from the ideal sillenite structure. Multi-slice simulations of electron-diffraction patterns are presented for different perturbations to the sillenite structure - partial substitution of the M site by Bi3+, random and ordered oxygen-vacancies, and a frozen-phonon model. Although comparison of experimental data to simulations cannot be conclusive, we consider the streaks as evidence of short-range ordered oxygen-vacancies.
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Research context
OpenAlex topics: Advanced Condensed Matter Physics · Crystal Structures and Properties · Magnetic and transport properties of perovskites and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
University of North Florida 1 Department of Physics, , Jacksonville, FL 32224 USA
Université Technologie de Troyes 2 Laboratoire de Nanotechnologie et d’Instrumentation Optique - UMR CNRS 6279, , 12 rue Marie Curie, Troyes 10010, France
University of North Florida 3 Department of Chemistry, , Jacksonville, FL 32224 USA
Osaka University 4 The Institute of Scientific and Industrial Research, , 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
Kochi University of Technology 5 School of Environmental Science and Engineering, , Tosayamada, Kami, Kochi 782-8502 Japan
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