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- W1645681903 startingPage "7091" @default.
- W1645681903 abstract "Polar regions are shown to mediate a strong coupling between polarization and strain in the paraelectric phase of the mixed ferroelectric ${mathrm{K}}_{1ensuremath{-}x}{mathrm{Li}}_{x}{mathrm{TaO}}_{3}$ (KLT) and ${mathrm{KTa}}_{1ensuremath{-}x}{mathrm{Nb}}_{x}{mathrm{O}}_{3}$ resulting in a field-induced piezoelectric response. The coupling is shown to result in a resonance in the dielectric spectrum of the crystals. In KLT, polar nanoregions can reorient via 180ifmmode^circelsetextdegreefi{} (ensuremath{pi} relaxation) or 90ifmmode^circelsetextdegreefi{} (ensuremath{pi}/2 relaxation) rotations. While the ensuremath{pi} relaxation is of no consequence, the ensuremath{pi}/2 relaxation has a strong influence on the overall character of the resonance. In addition to providing a mechanism for loss and degradation of the quality factor, this relaxation alters the character of the resonance as the two cross. Experimental results from dielectric spectroscopy above and below this crossover are presented and discussed. A simple theoretical Debye model involving the electrostrictive polarization-strain coupling is presented and the calculated spectrum is shown to reproduce the experimental spectrum. The parameters derived from the model are discussed. Most significantly, the electrostrictive coefficient of KLT is found to be 100 times larger than that of ${mathrm{BaTiO}}_{3},$ and is due to the presence of polar nanoregions." @default.
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- W1645681903 date "1999-09-01" @default.
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- W1645681903 title "Dielectric relaxation and resonance in relaxor ferroelectric<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>K</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Li</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi …" @default.
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- W1645681903 doi "https://doi.org/10.1103/physrevb.60.7091" @default.
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