期刊
JOURNAL OF RAMAN SPECTROSCOPY
卷 51, 期 7, 页码 1240-1247出版社
WILEY
DOI: 10.1002/jrs.5889
关键词
high-pressure Raman; hydrated compounds; reversible transition
类别
资金
- Chinese Academy of Sciences [2019-BEPC-PT-003237, 2017-BEPC-PT-000568]
- National Natural Science Foundation of China [11774247]
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 Gruneisen parameters. The pressure-induced structural change is correlated with the relatively isolated arrangement of Os-O polyhedron. In addition, the zero-pressure bulk modulus B-0 = 46(1) GPa and zero-pressure Gruneisen parameters gamma of K2OsO2(OH)(4) are given and discussed.
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