2026-03-06T02:18:36Z https://kutarr.kochi-tech.ac.jp/oai

oai:kutarr.kochi-tech.ac.jp:00000266 2023-05-15T13:39:55Z 5

Electron diffraction study of the sillenites Bi_<12>SiO_<20>, Bi_<25>FeO_<39> and Bi_<25>InO_<39> : Evidence of short-range ordering of oxygen-vacancies in the trivalent sillenites Scurti, Craig A. Auvray, Nicolas Lufaso, Michael W. Takeda, Seiji Kohno, Hideo Arenas, D. J. https://creativecommons.org/licenses/by/3.0/ | https://creativecommons.org/licenses/by/3.0/ We present an electron diffraction study of three sillenites, Bi_<12>SiO_<20>, Bi_<25>FeO_<39>, and Bi_<25>InO_<39> 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 Bi_<25>FeO_<39> and Bi_<25>InO_<39> 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 Bi^<3+>, 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. AIP Publishing 2014-08 eng journal article VoR http://hdl.handle.net/10173/1450 https://kutarr.kochi-tech.ac.jp/records/266 10.1063/1.4893341 AIP Advances 4 8 087125-1 087125-10 https://kutarr.kochi-tech.ac.jp/record/266/files/28-22.pdf application/pdf 1.8 MB 2019-02-13