Abstract
( Bi 2 − x Ca x ) ( Zn 1 ∕ 3 Ta 2 ∕ 3 ) 2 O 7 (0⩽x⩽1) ceramic were prepared by using a solid-state reaction technique. (Bi1.2Ca0.8)(Zn1∕3Ta2∕3)2O7 was found to have cubic pyrochlore structure, while (Bi1.9Ca0.1)(Zn1∕3Ta2∕3)2O7 was shown to have a monoclinic zirconolite structures. cubic pyrochlore (Bi1.2Ca0.8)(Zn1∕3Ta2∕3)2O7, not monoclinic zirconolite (Bi1.9Ca0.1)(Zn1∕3Ta2∕3)2O7, was found to show relaxation behavior at room temperature. Dielectric constant and dielectric loss were measured as functions of electric field and temperature. The results show a maximum tunability of 12% under a bias 60 KV∕cm in cubic-pyrochlore-structure (Bi1.2Ca0.8)(Zn1∕3Ta2∕3)2O7 ceramics.
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