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High-Pressure Elastic Anomalies of PbHf0.975Sn0.025O3 Single Crystals Studied by Using Brillouin Spectroscopy

High-pressure Brillouin spectroscopy was applied to the PbHf0.975Sn0.025O3 single crystal to obtain the pressure dependences of its acoustic properties. The Brillouin frequency shift of the longitudinal acoustic mode showed two anomalies, one at ∼2.5 GPa and the other at ∼9 GPa, indicating two pressure-induced phase transitions consistent with recent Raman measurements. The half width of this mode exhibited damping anomalies at nearly the same pressures. The possible origin and the nature of these transitions are discussed.