Behaviour of polyhedra in Sr2NiMoO6 at high pressure and temperature

C. L. Bull, C. J. Ridley, N. P. Funnell, K. S. Knight

Research output: Contribution to journalArticlepeer-review

Abstract

The high-pressure behaviour of Sr2NiMoO6 has been measured up to ∼6 ​GPa using neutron powder diffraction. With increasing pressure the tetragonal (I4/m) symmetry is maintained and the structure becomes more distorted. The distortion is a result of increased octahedral tilting away from the idealised cubic symmetry by rotation around the c-axis in the ab plane. The pressure equation of state has been determined and gives values of V0 ​= ​243.10(2) Å3, B0 ​= ​155(2) GPa and B’ ​= ​3.1(6). We also report the high temperature behaviour at ambient pressure and observe a transition from tetragonal to cubic symmetry at ∼ 573 ​K.

Original languageEnglish
Article number121474
JournalJournal of Solid State Chemistry
Volume290
DOIs
StatePublished - Oct 2020
Externally publishedYes

Keywords

  • High-pressure
  • High-temperature
  • Neutron diffraction
  • Octahedral tilting
  • Perovskite
  • SrNiMoO

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