Temperature impedance spectroscopy of (1-x)Na1/2Bi1/2TiO3-xLaMg(1/2)Ti(1/2)O(3) solid solutions

resumo

The dielectric properties of (1-x)Na1/2Bi1/2TiO3-xLaMg(1/2)T(1/2)O(3) solid solutions (0 <= x <= 0.4) were studied over the temperature range 650-1030 K by measuring the impedance spectra over the frequency range 25-10(6) Hz. The Curie temperature T-C was determined as a function of the composition of the solid solutions. It is shown that T-C decreases linearly with increasing x. The temperature dependences of the dc component (sigma(dc)) and the polarization component (sigma(')(ac)) of the real part of the conductivity are found. The activation energy for the conductivity sigma(dc) is shown to increase abruptly as the temperature increases above approximately 770 K for all solid solution compositions. Over the temperature range corresponding approximately to the region of existence of the tetragonal phase of Na1/2Bi1/2TiO3, the polarization component sigma(')(ac) of the solid solutions, as well as that of the pure compound, is anomalously high at low frequencies, which can be due to structural inhomogeneities.

palavras-chave

DIELECTRIC-PROPERTIES; MODULUS SPECTROSCOPY; CERAMICS; NA0.5BI0.5TIO3; RELAXATION; LEAD; PEROVSKITES; BEHAVIOR

categoria

Physics

autores

Olekhnovich, NM; Moroz, II; Pushkarev, AV; Radyush, YV; Salak, AN; Vyshatko, NP; Ferreira, VM

nossos autores

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