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Review on first quantitative far-infrared transmission measurements of the ferroelectric soft-mode response is given on several perovskite ferroelectric, antiferroelectric, relaxor ferroelectric and incipient ferroelectric films. The following films, mostly prepared by sol-gel technique on a sapphire substrate (film thickness from 100 to 1000 nm) were investigated: PbTiO3, PbZrO3, PbZr0.53Ti0.47O3, PbZr0.75Ti0.25O3, PLZT 9.5/65/35, 8/65/35, 2/95/5, SrTiO3, BaTiO3, Ba0.35Sr0.65TiO3, Ba0.65Sr0.35TiO3, and PbSc0.5Ta0.5O3. Whereas in the PZT system the soft mode parameters do not substantially differ from those in bulk materials, in the BST system dramatic differences have been observed, particularly in SrTiO3 at low temperatures. Low-frequency dielectric properties are also discussed.
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Petzelt et al. (2001) studied this question.
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