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Brillouin scattering study of phase transitions in antiferroelectric PbZr 0.78 Sn 0.22 O 3 (PZS) single crystals were performed in the temperature range 300–1173K. The frequency of longitudinal acoustic (LA) mode begins to exhibit a strong decrease below about 950K, followed by an increase in the line-width below about 700K. The line-width (frequency) exhibits a maximum (minimum)...
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