Abstract
Modification of dielectric characteristics of Bi 1.5ZnNb 1.5O 7 pyrochlore was performed by Sr substitution for Zn in A-site together with the phase evolution. In general, the ceramics prepared by solid-state reaction are multiphase materials. However, single phase specimens having cubic pyrochlore structure could be obtained in the vicinity of Sr=0.1. The temperature coefficient of the dielectric constant ( α c) of Bi 1.5ZnNb 1.5O 7 increased remarkably by Sr substitution, but dielectric constant varied slightly while the dielectric loss increased steadily. Ceramics of those series have dielectric properties of high ε (>145) and low temperature coefficient. The A-site cation substitution caused a very slight change in dielectric constant, suggesting little effect of the substitution on the ionic polarization of the pyrochlore structure.
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