Abstract
Abstract The phase evolution, microstructure and dielectric properties in the Ca 2+ substituted Bi 2 O 3 –ZnO–Nb 2 O 5 system were studied. The crystalline phases of the [Bi 1.8 (Ca x Zn 1− x ) 0.2 ](Zn 0.6 Nb 1.4 )O 7 pyrochlores (0.0≤ x ≤1.0) depend greatly on the ratio of ionic radius A/B. With the Ca 2+ substitution for Zn 2+ in the A site, the crystalline phase transformed from cubic to monoclinic and pure monoclinic phase was obtained for x ≥0.5. As the x value increased from 0.5 to 1.0, the permittivity in the microwave range decreased from 76.4 to 75.0, the quality factor Qf value increased from 1800 to 4700 GHz, and the TCF value shifted from −99 to −147 ppm/°C.
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