Premium
Raman spectroscopy and X‐ray diffraction of pressure‐induced reversible structure change in K 2 OsO 2 (OH) 4
Author(s) -
Tang Qiqi,
Liu Shan,
Wu Binbin,
Zhang Feng,
Lei Li
Publication year - 2020
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.5889
Subject(s) - raman spectroscopy , diffraction , x ray crystallography , bulk modulus , crystallography , analytical chemistry (journal) , chemistry , phonon , materials science , optics , condensed matter physics , physics , chromatography , composite material
High‐pressure structural evolution of K 2 OsO 2 (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 B 0 = 46(1) GPa and zero‐pressure Grüneisen parameters γ of K 2 OsO 2 (OH) 4 are given and discussed.