The structural and lattice dynamical aspects of the incommensurate phase transition in ThBr 4 (T c =95K) are studied by means of elastic and inelastic neutron scattering. Above T c the temperature-dependent softening of a low-lying optic mode of wavevector q s approximately=0.3 c* is observed. The combined analysis of the room-temperature optical spectra and of the satellite extinction rules (T
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Bernard et al. (1983) studied this question.
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