Вышедшие номера
Giant dielectric relaxation in SrTiO3--SrMg1/3Nb2/3O3 and SrTiO3--SrSc1/2Ta1/2O3 solid solutions
Lemanov V.V.1, Sotnikov A.V.1,2, Smirnova E.P.1, Weihnacht M.
1A.F. Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg, Russia
2Leibniz Institute of Solid State and Materials Research Dresden, Dresden, Germany
Поступила в редакцию: 11 апреля 2002 г.
Выставление онлайн: 20 октября 2002 г.

Ceramic samples of (1-x) SrTiO3-x SrMg1/3Nb2/3O3 and (1-x) SrTiO3-x SrSc1/2Ta1/2O3 were prepared and their dielectric properties were studied at x=0.005-0.15 and 0.01-0.1, respectively, at frequencies 10 Hz-1 MHz and at temperatures 4.2-350 K. A giant dielectric relaxation was observed in the temperature range 150-300 K, and not so strong but well-developed relaxation was found in the temperature range 20-90 K. The activation energy U and the relaxation time tau0 were determined to be 0.21-0.3 eV and 10-11-10-12 s for the high-temperature relaxation and 0.01-0.02 eV and 10-8-10-10 s for the low-temperature relaxation. The additional local charge compensation of the heterovalent impurities Mg2+ and Nb5+ (or Sc3+ and Ta5+) by free charge carriers or the host ion vacancies is suggested as underlying physical mechanism of the relaxation phenomena. On the base of this mechanism, the Maxwell-Wagner model and the model of reorienting dipole centers Mg2+ (or Sc3+) associated with the oxygen vacancy are proposed to explain the high-temperature relaxation with some arguments in the favour of the latter model. The polaron-like model with the Nb5+-Ti3+ center is suggested as the origin of the low-temperature relaxation. The reasons of no ferroelectric phase transitions in the solid solutions under study are also discussed.
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