The structure of ferroselite, FeSe2, at pressures up to 46 GPa and temperatures down to 50 K: A single-crystal micro-diffraction analysis

Barbara Lavina, Robert T. Downs, Stanislav Sinogeikin

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

We conducted an in situ crystal structure analysis of ferroselite at non-ambient conditions. The aim is to provide a solid ground to further the understanding of the properties of this material in a broad range of conditions. Ferroselite, marcasite-type FeSe2, was studied under high pressures up to 46 GPa and low temperatures, down to 50 K using single-crystal microdiffraction techniques. High pressures and low temperatures were generated using a diamond anvil cell and a cryostat respectively. We found no evidences of structural instability in the explored P-T space. The deformation of the orthorhombic lattice is slightly anisotropic. As expected, the compressibility of the Se-Se dumbbell, the longer bond in the structure, is larger than that of the Fe-Se bonds. There are two octahedral Fe-Se bonds, the short bond, with multiplicity two, is slightly more compressible than the long bond, with multiplicity four; as a consequence the octahedral tetragonal compression slightly increases under pressure. We also achieved a robust structural analysis of ferroselite at low temperature in the diamond anvil cell. Structural changes upon temperature decrease are small but qualitatively similar to those produced by pressure.

Original languageEnglish (US)
Article number289
JournalCrystals
Volume8
Issue number7
DOIs
StatePublished - Jul 13 2018

Keywords

  • FeSe
  • High pressure
  • Low temperature
  • Single-crystal diffraction

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Inorganic Chemistry

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