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The Effect of Size, Strain, and Long-Range Interactions on Ferroelectric Phase Transitions in KNbO3KTaO3KNbO3 Superlattices Studied by X-ray, EXAFS, and Dielectric Measurements

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Abstract

Epitaxial, uniformly strained superlattices of ferroelectric KNbO3 and paraelectric KTaO3 are studied with respect to their structural and dielectric properties. For dielectric measurements, perfectly lattice-matched conducting KNbO3Sr(Ru0.5Sn0.5)O3 electrodes are used, and a broad, frequency-dependent maximum is observed in the capacitance-vs-temperature curves. Niobium K-edge glancing-angle EXAFS provides information regarding the crystal structure of KNbO3 films as thin as two unit cells in superlattices with equal KTaO3 and KNbO3 layer thicknesses, showing a clear difference between these thinnest-layer superlattices and films of the KNbO3K(Ta0.5Nb0.5O3 solid-solution. X-ray diffraction measurements, on the other hand, indicate that these samples exhibit the same transition temperature KNbO3Tc, indicating the importance of long-range electrostatic interactions. Analysis of the transition temperature for various structures leads to a clear identification of the effect of size and strain on KNbO3Tc.

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Authors and Affiliations

  1. Neocera, Inc., 10000 Virginia Manor Road, Suite 300, Beltsville, MD, 20705

    H.-M. Christen & K.S. Harshavardhan

  2. Oak Ridge National Laboratory, Oak Ridge, TN, 37831

    M.F. Chisholm, E.D. Specht, J.D. Budai, D.P. norton & L.A. Boatner

  3. Stanford Synchrotron Radiation Laboratory/SLAC, Stanford, CA, 94309

    I.J. Pickering

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  1. H.-M. Christen
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  2. K.S. Harshavardhan
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Christen, HM., Harshavardhan, K., Chisholm, M. et al. The Effect of Size, Strain, and Long-Range Interactions on Ferroelectric Phase Transitions in KNbO3KTaO3KNbO3 Superlattices Studied by X-ray, EXAFS, and Dielectric Measurements. Journal of Electroceramics 4, 279–287 (2000). https://doi.org/10.1023/A:1009994004989

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