Abstract
Abstract Sn2Se6 is one of the few semiconductive proper ferroelectrics with an incommensurate phase. The IC phase (193 K < T < 221 K) is intermediate between a high temperature paraelectric (PE) and ferroelectric (FE) phase. Raman spectra studies have been performed to investigate the relation in lattice dynamics of the phase sequence PE-IC-FE. The soft mode in the FE phase could be distinguished. This mode together with a central peak contribute to the strong low frequency scattering. In the IC phase two new modes appear at 8 and 19 cm−1. The first could be identified as a folded acoustic mode, whereas the other might be a folded optical mode.
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