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Browsing by Author "Engel, J."

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    Pressure-induced phase transition in PbSc0.5Ta0.5O3 as a model Pb-based perovksite-type relaxor ferroelectric
    Mihailova, B.; Angel, R. J.; Welsch, A. M.; Zhao, J.; Engel, J.; Paulmann, C.; Gospodinov, M.; Ahsbahs, H.; Stosch, R.; Guttler, B.; Bismayer, U. (American Physical Society, 2008-07-04)
    We report pressure-induced structural changes in PbSc0.5Ta0.5O3 studied by single-crystal x-ray diffraction and Raman scattering. The appearance of a soft mode, a change in the volume compressibility, broadening of the diffraction peaks, and suppression of the x-ray diffuse scattering show that a phase transition occurs near p(c)similar to 1.9 GPa. The critical pressure is associated with a decoupling of the displacements of the B site and Pb cations in the existing polar nanoregions, leading to the suppression of B-cation off-center shifts and enhancement of the ferroic distortion in the Pb-O system.