Crystal structure of Ca(Fe0.4Si0.6)O2.8oxygen-deficient perovskite

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Abstract

The crystal structure of Ca(Fe3+0.4Si0.6)O2.8 oxygen-deficient perovskite phase synthesized at 12 GPa and 1400 °C was studied using synchrotron powder X-ray diffraction. The phase is isostructural to low-pressure phase of Ca(Al0.4Si0.6)O2.8. The structure was refined by the Rietveld method and is consists of a perovskite-like triplelayer of corner-shared (Fe3+,Si)O6 octahedra and a double-layer of SiO4 tetrahedra those are stacked alternatively in the [111] direction of ideal cubic perovskite. Small degree of Fe3+/Si disorder was detected between two octahedral sites. The structure is compared with other oxygen-deficient perovskites.

Original languageEnglish
Pages (from-to)843-846
Number of pages4
JournalJournal of the Ceramic Society of Japan
Volume128
Issue number10
DOIs
Publication statusPublished - Oct 2020

Keywords

  • Crystal structure
  • High-pressure silicate
  • Oxygen-deficient perovskite
  • Rietveld refinement

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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