The Raman spectrum of WO3 has been investigated from -180 to 290°C. An interpretation of the phonon spectra of the phases with higher symmetries is carried out by group theory. The normal coordinates of tetragonal WO3 have been calculated and a correlation of the phase transitions with the critical behaviour of some of the normal modes has been attempted.
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Ekhard K. H. Salje (1975) studied this question.