Dielectric properties of Bi3Zn2Sb3O14 ceramics at high temperature

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.