Dielectric dispersion in Bi3Zn2Sb3O14 ceramic: a pyrochlore type phase

Materials Research

Silvania Lanfredi¹  Marcos A. De Lima Nobre¹ 

[1] ,Universidade de São Paulo Instituto de Física de São Carlos São Carlos SP ,Brazil

关键词: varistor;    pyrochlore;    impedance spectroscopy;    dielectric;   

DOI  :  10.1590/S1516-14392003000200008

来源: SciELO

【 摘 要 】

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/omega, where omega represents the angular frequency (2pif). The parameter epsilon = f(T) exhibits values in the range from 40 to 48. The dielectric losses (tandelta) show slight dependence with the temperature up to 400 °C. A strong increasing of the tandeltaoccurs at temperatures higher than 400 °C. In a general way, a decrease of the parameter tandelta occurs with the increasing frequency.

【 授权许可】

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