The high-pressure behaviour of Sr₂NiMoO₆ has been measured up to $\sim$6 ​GPa using neutron powder diffraction. With increasing pressure the tetragonal ($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) ų, 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 $\sim$ 573 ​K.

中文翻译：

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高温高压下Sr ₂ NiMoO ₆中多面体的行为

一直测量到Sr ₂ NiMoO ₆的高压行为$〜$6 GPa用中子粉末衍射法。随着压力的增加，四边形（$\mathrm{一世}4/米$）保持对称性，并且结构变得更扭曲。畸变是由于通过在ab平面中绕c轴旋转而使八面体的倾斜远离理想立方对称性的结果。状态的压力方程已被确定并给出的值V ₀  = 243.10（2）埃³，乙₀  = 155（2）和GPA乙'= 3.1（6）。我们还报告了在常压下的高温行为，并观察到从四方对称向立方对称过渡。$〜$ 573千