Crystal structure of SrGeO3 in the high-pressure perovskite-type phase

Akihiko Nakatsuka, Hiroshi Arima, Osamu Ohtaka, Keiko Fujiwara, Akira Yoshiasa, M. Weil

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Single crystals of the SrGeO3 (strontium germanium trioxide) high-pressure phase have been synthesized successfully at 6 GPa and 1223 K. The compound crystallizes with the ideal cubic perovskite-type structure (space group Pm3m), which consists of a network of corner-linked regular GeO6 octahedra (point-group symmetry m3m), with the larger Sr atoms located at the centers of cavities in the form of SrO12 cuboctahedra (point-group symmetry m3m) in the network. The degrees of covalencies included in the Sr - O and the Ge - O bonds calculated from bond valences are 20.4 and 48.9%, respectively. Thus, the Ge - O bond of the GeO6 octahedron in the SrGeO3 perovskite has a strong covalency, comparable to those of the Si - O bonds of the SiO4 tetrahedra in silicates with about 50% covalency. The thermal vibrations of the O atoms in the title compound are remarkably suppressed in the directions of the Ge - O bonds. This anisotropy ranks among the largest observed in stoichiometric cubic perovskites.

Original languageEnglish
Pages (from-to)502-504
Number of pages3
JournalActa Crystallographica Section E: Structure Reports Online
Volume71
Issue number5
DOIs
Publication statusPublished - 2015 May 1

Keywords

  • Crystal structure
  • High-pressure phase
  • Perovskite
  • Strontium germanate

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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