Abstract
Vibrational properties of relaxor ferroelectric strontium barium niobate (SrxBa1−xNb2O6, SBN-x) with x = 0.61 were investigated by high-resolution Raman scattering. The depolarized Raman spectra with the a(c,b)ā configuration, where a, b and c denote the crystallographic axes of the tetragonal system, were measured in a wide temperature range from 600°C to room temperature. Most optic modes were insensitive to or showed a change in the slope at the ferroelectric phase transition (Tc ∼73°C), while the two optic modes located at ∼200 and ∼280 cm−1 exhibited a noticeable softening in a specific temperature range from Tc to ∼150°C. This temperature range was the same to that where substantial acoustic anomalies were observed, which could be attributed to the formation of quasi-static precursor polar regions near Tc in the paraelectric phase.
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