Dielectric properties of BT-LMT mixed ceramics

resumo

Two types of ceramics of (1-x)BaTiO(3)-xLa(Mg(1/2)Ti(1/2)O(3)) with x = 0.025 (0.975BT-0.025LMT) were dielectrically investigated over the extended frequency range. Dielectric studies have been performed in the frequency range from 20Hz to 10GHz within the temperature interval of -170-230 degrees C. It is shown. that in these ceramics BT-type three phase transitions become diffuse and typical relaxor type dispersion is observed. Maxima of both imaginary and real parts of the dielectric permittivity are shifted to lower temperatures in comparison with pure BT and in the temperature ranges close to the phase transitions show a strong frequency-dependent behaviour. The distribution function of the relaxation times g(tau) was calculated from dielectric measurements for both measured ceramics-homogenous and non-homogenous. Dynamics of the phase transitions are discussed. (c) 2007 Elsevier Ltd. All rights reserved.

palavras-chave

RELAXOR; BEHAVIOR

categoria

Materials Science

autores

Keburis, P; Banys, J; Grigas, J; Brilingas, A; Burtilius, T; Salak, AN; Ferreira, VM

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