Raman Spectroscopic Study of the Structural Phase Transitions in K2SnCl6

Abstract
Raman spectra of K2SnC16 are investigated in the temperature range between 50 and 300 K. The observed low temperature spectra are compatible with the proposed monoclinic structure. Two bands that exhibit a soft behaviour are assigned to a zone center and zone boundary rotational mode, respectively. It is supposed that these modes drive the structural phase transitions at T1 = 263 K and T2 = 255 K.