Behaviour of polyhedra in Sr2NiMoO6 at high pressure and temperature

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 idealise...

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Bibliographic Details
Published inJournal of solid state chemistry Vol. 290; p. 121474
Main Authors Bull, C.L., Ridley, C.J., Funnell, N.P., Knight, K.S.
Format Journal Article
LanguageEnglish
Published Elsevier Inc 01.10.2020
Subjects
High-pressure
High-temperature
Neutron diffraction
Octahedral tilting
Perovskite
Sr2NiMoO6
Perovskite
High-temperature
Sr2NiMoO6
Neutron diffraction
Octahedral tilting
High-pressure
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Summary: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. The high-pressure behaviour of the perovskite Sr2NiMoO6 has been measured up to ~6 ​GPa using neutron powder diffraction. [Display omitted] •Compression of Sr2NiMoO6.•Increase in octahedral tilting.•High pressure equation of state.
ISSN:0022-4596
1095-726X
DOI:10.1016/j.jssc.2020.121474