期刊
MATERIALS LETTERS
卷 47, 期 6, 页码 362-366出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0167-577X(00)00267-6
关键词
pyrochlore; Bi3Zn2Sb3O14; powder; synthesis; polimeric precursors; complex impedance; dielectric properties
The dielectric permittivity of the phase Bi3Zn2Sb3O14 was studied by means of impedance spectroscopy. The measurements were performed in the frequency range of 5 Hz-13 MHz and at temperatures ranging from 100 degreesC to 500 degreesC. 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 (2 pif). The parameter epsilon = f(T) exhibits values in the range of 40-48. The dielectric losses (t(g)delta) exhibit slight dependence with the temperature up to 400 degreesC. A strong increase occurs at temperatures higher than 400 degreesC. In a general way, a decrease of the parameter t(g)delta occurs with increasing frequency. (C) 2001 Elsevier Science B.V. All rights reserved.
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