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Artigo Científico | Materiais Semicondutores e Ferroelétricos | Inglês | 24/03/2003
Autores: Marcos A. de Lima Nobre, S. Lanfredi
Palavras-chave: dielectric, impedance spectroscopy, pyrochlore, varistor
Resumo: The electric and dielectric properties of Bi3Zn2Sb3O14 ceramic were studied by impedance spectroscopy. The measurements were performed in the frequency range 5 to 13 MHz and at temperature ranges from 25 to 700 °C. The permittivity was calculated by the variation of the imaginary part of the impedance (-Im(Z)) as function of 1/w, where w represents the angular frequency (2pf). The parameter e = f(T) exhibits values in the range from 40 to 48. The dielectric losses (tand) show slight dependence with the temperature up to 400 °C. A strong increasing of the tand occurs at temperatures higher than 400 °C. In a general way, a decrease of the parameter tand occurs with the increasing frequency.
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