Raman spectroscopy and X‐ray diffraction of pressure‐induced reversible structure change in K2OsO2(OH)4,Journal of Raman Spectroscopy

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Raman spectroscopy and X‐ray diffraction of pressure‐induced reversible structure change in K2OsO2(OH)4
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-04-27 , DOI: 10.1002/jrs.5889
Qiqi Tang ₁ , Shan Liu ₁ , Binbin Wu ₁ , Feng Zhang ₁ , Li Lei ₁

Affiliation

High‐pressure structural evolution of K₂OsO₂(OH)₄, a potassium osmate dihydrate, has been studied by high‐pressure Raman spectroscopy and angle dispersive X‐ray diffraction. A pressure‐induced reversible structure change is observed at approximately 8 GPa, evidenced by the splitting of Raman modes and the addition of X‐ray diffraction peaks. The splitting of phonon generally occurs in the Raman modes with smaller Grüneisen parameters. The pressure‐induced structural change is correlated with the relatively isolated arrangement of Os–O polyhedron. In addition, the zero‐pressure bulk modulus B₀ = 46(1) GPa and zero‐pressure Grüneisen parameters γ of K₂OsO₂(OH)₄ are given and discussed.

中文翻译：

拉曼光谱和X射线衍射法分析K2OsO2（OH）4中压力诱导的可逆结构变化

通过高压拉曼光谱和角度色散X射线衍射研究了钾酸钾二水合物K ₂ OsO ₂（OH）₄的高压结构演化。在大约8 GPa处观察到压力引起的可逆结构变化，这可以通过拉曼模式的分裂和X射线衍射峰的添加来证明。声子的分裂通常发生在具有较小Grüneisen参数的拉曼模式中。压力引起的结构变化与Os–O多面体的相对隔离的布置有关。此外，零压力体积模量乙₀ = 46（1）GPA和零压力Grüneisen参数γ的K ₂的OsO ₂（OH）₄给出并讨论。

更新日期：2020-04-27

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