In this paper the temperature evolution of the main Raman peak at about 630 cm −1 has been studied in order to detect the ferroelectric to paraelectric phase transition in strontium barium niobate (Sr x Ba 1− x Nb 2 O 6 ) crystals with different stoichiometries ( x = 0.33, 0.5 and 0.61). Both its peak wavenumber and width have been shown to be strongly dependent on temperature and display clear anomalies around the Curie temperature. The obtained results manifest the usefulness of simple unpolarized Raman spectra to probe the changes in T c as a result of modifications in the crystal composition.
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Speghini et al. (2006) studied this question.
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