E.A. Pavlatou
Chimica Chronica-New Series (1994), 23, 265-270
Raman spectra of ZnCl2, ZnBr2 and their mixtures were measured in the glassy and liquid state, at various temperatures and compositions. The overall behavior of the spectra indicates the presence of different bonding states in the "network" structure, where halogen atom sharing of the ZnX4 (X=Cl, Br) tetrahedral groups occurs. Furthermore, at elevated temperatures the "network" structure breaks up, creating in the melt non bridging halogen atoms which are bound to a three-fold coordinated Zn atom. The spectra of the binary ZnCl2-ZnBr2 system show that the mixtures are formed by a random closest packing of halogen atoms. The observed similarities between depolarized reduced Raman spectra and the total density of vibrational states in the glassy and liquid state are presented and discussed.