Polarized Raman spectra of [N(CH3)4]2ZnCl4 crystals are studied in phase I in the frequency range between 10 and 3500 cm−1. An assignment of the lines observed to motion types is carried out. The sublattice of the TMA ions is found to behave as a quasi‐liquid. The distorsion of the ZnCl 42‐ tetrahedra is insignificant. A considerable orientational disorder is shown to occur in this phase.
Polarized Raman and infrared specha of LiZGe70LS single crystals were measured in the frequency m g e 5-1000 cm-' at mom temperature. The spectra are analysed within the framework of the Landau thwry of Seucnual phase bnsitions from a (hypothetical) fully disordered deficient structure (aristotype). The mechanism of the phase transition is discussed in terms of ordering and shifts of ions.
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