Polarized Raman spectra of Cs2CdBr4 single crystals were measured in the frequency range 0-350 cm-' at 100-290 K. The spectra are analysed within the framework of the Landau theory of stmctural phase transitions; the analysis indicates that the transition to the triclinic phase with P i symmetry is accompanied by unit-cell volume multiplication.
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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