Abstract
The pressure evolution of the local structure and dynamics of polar nanoregions inPbSc0.5Nb0.5O3 relaxor ferroelectric is analysed by Raman spectroscopy. The pressure dependence ofphonon modes up to 10 GPa reveals three characteristic pressures related to changes in thelocal structure: near 2 GPa, at which ferroic ordering in the Pb system occurs; near 4 GPa,at which significant structural transformations, involving decoupling of Pb and B-cations inpolar nanoclusters and suppression of the B-cation off-centring take place; and near 6 GPa,at which the system reaches a saturation state. The structural transformations observed inPbSc0.5Nb0.5O3 are comparedto those in PbSc0.5Ta0.5O3 and other Pb-based perovskite-type relaxor ferroelectrics.
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