Dielectric dispersion in Bi3Zn2Sb3O14 ceramic: a pyrochlore type phase

Silvania Lanfredi; Marcos A. de Lima Nobre

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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Dielectric dispersion in Bi3Zn2Sb3O14 ceramic: a pyrochlore type phase

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Author(s):	Silvania Lanfredi ^[1] ; Marcos A. de Lima Nobre ^[2] Total Authors: 2
Affiliation:	^[1] Universidade de São Paulo. Instituto de Física de São Carlos - Brasil ^[2] Universidade de São Paulo. Instituto de Física de São Carlos - Brasil Total Affiliations: 2
Document type:	Journal article
Source:	MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 6, n. 2, p. 157-161, 2003-06-00.
Abstract
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. (AU)

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