Premium
Raman spectroscopic study of phase transformation in single crystals of cadmium fluorosilicate hexahydrate
Author(s) -
Thakur Ganesh,
Verma A. L.
Publication year - 1989
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.1250200605
Subject(s) - raman spectroscopy , chemistry , ion , degenerate energy levels , phase transition , crystallography , cadmium , lattice vibration , phase (matter) , lattice (music) , analytical chemistry (journal) , phonon , condensed matter physics , optics , physics , organic chemistry , chromatography , quantum mechanics , acoustics
A detailed temperature‐dependent Raman study of oriented single crystals of CdSiF 6 · 6H 2 O down to 10 K was made in the region of internal vibrations and lattice modes. The frequency shifts, Iinewidths and intensities of some of the modes associated with the [Cd(OH 2 ) 6 ] 2+ and (SiF 6 ) 2− ions show abrupt changes at temperatures around 220 K and some doubly degenerate modes split into two components. These studies suggest that the system undergoes a structural phase transition at ca. 220 K.