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The existing results on soft-mode spectroscopy of BST films and ceramics, including both pure compounds, are reviewed and complemented by our recent data. Particularly strong differences are revealed between the behavior of thin films and bulk materials in the case of SrTiO 3 at low temperatures. In analogy with SrTiO 3 ceramics, they are explained mainly by the granularity causing a local co-existence of polar and structural distortions at low temperatures.
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Petzelt et al. (2002) studied this question.
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