ISSN:
1063-7834
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1134/1.1130182
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