PRESSURE-INDUCED PHASE-TRANSITIONS IN MO8O23

H SOWA*, W STEURER, JL DEBOER

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)

Abstract

The variation of lattice parameters with pressure was studied on single-crystals of Mo8O23 up to 6.03(7) GPa by X-ray diffraction methods. The crystal, which at ambient conditions has an incommensurately modulated phase with superspace group

B P2/c/11 (0.188,1/2,0.133)

is highly compressible, with a lock-in phase transition to a commensurate superstructure below 0.94(7) GPa and a reversible first-order phase transition between 1.40(7) and 1.77(7) GPa. The compressibility of the high-pressure phase results in an anisotropic crystal with lattice parameters alpha and beta only slightly changing with pressure contrary to the much more varying b and c. The high-pressure behaviour of both Mo8O23 phases can qualitatively be described by different rotations of the MoO6 octahedra leading to higher 0-0 coordination numbers and therewith to denser packings of oxygen atoms.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalPhase Transitions
Volume47
Issue number1-2
Publication statusPublished - 1994

Keywords

  • MO8O23
  • HIGH PRESSURE
  • PHASE TRANSITION
  • X-RAY-DIFFRACTION
  • REO3

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