Behaviour of polyhedra in Sr2NiMoO6 at high pressure and temperature
2020
Abstract The high-pressure behaviour of Sr2NiMoO6 has been measured up to ∼ 6 GPa using neutron powder diffraction. With increasing pressure the tetragonal ( I 4 / 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) A3, 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.
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