Abstract
The dielectric permittivity and losses of the (SrTiO3)0.85(KTaO3)0.15 solid solution have revealed an unusual behavior at temperatures of 5–300 K and frequencies ranging from 100 Hz to 1 MHz. The dielectric permittivity exhibits a broad maximum at ≈40 K, which obeys the Curie-Weiss law in the high-temperature wing, and the onset of low-temperature relaxation contributions. Besides, while for T>40 K it is a fully ergodic, uniformly ordering system, the uniform polar ordering is replaced with decreasing temperature by two low-temperature phase transitions to a glass-like state. The proposed mechanism for the dielectric relaxation and the observed phase transformations involves reorientation and ordering in the system of electron and hole polarons, which form in the course of charge compensation of the heterovalent ions Sr2+, K+ and Ti4+, Ta5+ distributed randomly in the sublattices.
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References
M. E. Lines and A. M. Glass, Principles and Applications of Ferroelectrics and Related Materials (Clarendon, Oxford, 1979) [Russian trans., Mir, Moscow, 1981].
B. Salce, J. L. Gravil, and L. A. Boatner, J. Phys.: Condens. Matter 6, 4077 (1994).
T. Mitsui and W. B. Westphal, Phys. Rev. 124, 1354 (1961).
S. H. Wemple, Phys. Rev. 137,5A, 1575 (1965).
U. T. Höchli, K. Knorr, and A. Loidl, Adv. Phys. 39, 405 (1990).
J. Toulouse, Ferroelectrics 151, 215 (1994).
V. Trepakov, F. Smutny, V. Vikhnin, V. Bursian, L. Sochava, L. Jastrabik, and P. Syrnikov, J. Phys.: Condens. Matter 7, 3765 (1995).
V. V. Lemanov, N. V. Zaitseva, E. P. Smirnova, and P. P. Syrnikov, Fiz. Tverd. Tela (St. Petersburg) 37, 1854 (1995) [Phys. Solid State 37, 1010 (1995)].
V. V. Lemanov, E. P. Smirnova, and E. A. Tarakanov, Fiz. Tverd. Tela (St. Petersburg) 37, 2476 (1995) [Phys. Solid State 37, 1356 (1995)].
J. G. Bednorz and K. A. Müller, Phys. Rev. Lett. 52, 2289 (1984).
Physics and Chemistry of Solids, edited by Yu. N. Venevtsev (NIFKhI, Moscow, 1976), No. 6, p. 96.
Yu. N. Venevtsev, E. D. Popolitova, and S. A. Ivanov, Ferro-and Antiferroelectrics of the Barium Titanate Family [in Russian], Khimiya, Moscow, 1985.
V. V. Lemanov, V. A. Trepakov, P. P. Syrnikov, M. Savinov, and L. Jastrabik, Fiz. Tverd. Tela (St. Petersburg) 39, 1838 (1997) [Phys. Solid State 39, 1642 (1997)].
F. Jona and G. Shirane, Ferroelectric Crystals (Pergamon Press, Oxford, 1962) [Russian trans., Mir, Moscow, 1965].
B. Jaffe, W. R. Cook, and H. Jaffe, Piezoelectric Ceramics (Academic Press, London, 1971) [Russian trans., Mir, Moscow, 1974].
F. Chu, I. M. Reaney, and N. Setter, Ferroelectrics 151, 343 (1994).
W. Kleemann, J. Mod. Phys. B 7, 2469 (1993).
V. S. Vikhnin, Z. Phys. Chem. (in press).
Th. W. Kool and O. F. Schirmer, Abstracts of XIII Intern. Symp. Electrons and Vibrations in Solids and Finite Systems (Jahn-Teller Effect) (Berlin, 1996).
O. Bidault, M. Maglione, M. Actis, and M. Kchikech, Phys. Rev. B 52, 4191 (1995).
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Fiz. Tverd. Tela (St. Petersburg) 39, 2040–2045 (November 1997)
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Trepakov, V.A., Vikhnin, V.S., Syrnikov, P.P. et al. Dielectric permittivity and phase transitions in the SrTiO3-KTaO3 system. Phys. Solid State 39, 1825–1828 (1997). https://doi.org/10.1134/1.1130182
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DOI: https://doi.org/10.1134/1.1130182