2003•Applied Physics LettersRequires access
Dielectric properties of Bi2O3–ZnO–Ta2O5 pyrochlore and zirconolite structure ceramics
Chen Ang, Zhi Yu, H. J. Youn, Clive A. Randall, A. S. Bhalla, L. E. Cross, Michael T. Lanagan
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Abstract
This letter reports the dielectric properties of the cubic pyrochlore (Bi3/4Zn1/4)2(Zn1/4Ta3/4)2O7, monoclinic zirconolite Bi2(Zn1/3Ta2/3)2O7, and their composites in the temperature range of 10–400 K from 102 to ∼1010 Hz. Composites with a near zero temperature coefficient of capacitance (TCC) consisting of the cubic pyrochlore and monoclinic zirconolite phases have been obtained. The observed microwave dielectric properties (ε=∼60, Q=∼325, and TCC=∼30 ppm/K at ∼5.1 GHz) as well as their low sintering temperatures (950–1100 °C) show that the compounds are promising materials for recently developed microwave devices, which demand that dielectric ceramics can be cofired with silver electrodes.