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    Effect of Ba incorporation on pressure-induced structural changes in the relaxor ferroelectric PbSc0.5Ta0.5O3

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    Date
    2009-09-28
    Author
    Welsch, A. M.
    Maier, B. J.
    Engel, J. M.
    Mihailova, B.
    Angel, R. J.
    Paulmann, C.
    Gospodinov, M.
    Friedrich, A.
    Stosch, R.
    Guttler, B.
    Petrova, D.
    Bismayer, U.
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    Abstract
    Pressure-induced structural changes in the canonical relaxor Pb0.78Ba0.22Sc0.5Ta0.5O3 were studied with both in-house and synchrotron single-crystal x-ray diffraction as well as Raman spectroscopy at pressures up to 9.8 GPa. The results reveal that the substitution of Ba for Pb in ABO(3) perovskite-type structures, i.e., the substitution of a two-valent element with an isotropic electron shell for an isovalent element with a stereochemically active lone pair, leads to a "diffuse pressure-induced phase transition," a structural transformation over a broad pressure range, without a well-defined critical pressure point. The smeared phase transition of the average structure results from the existence of local structural deformations in the vicinity of A-positioned Ba cations.
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    http://hdl.handle.net/10919/25368
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    • Scholarly Works, Department of Geosciences [214]

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