Journal
JOURNAL OF ELECTROCERAMICS
Volume 21, Issue 1-4, Pages 461-464Publisher
SPRINGER
DOI: 10.1007/s10832-007-9221-4
Keywords
Bismuth zinc niobate; Pyrochlore; Calcium-substitution; Dielectric properties
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The effect of the chemical substitution of Ca cation on the microstructure and microwave dielectric properties of bismuth-based pyrochlores has been investigated. Broad ranges of solid solutions based on (Bi-3x,Zn2-3x)(ZnxNb2-x)O-7 (x=0.56-0.64) were obtained with Ca cation substitution of Zn at A site. The XRD patterns revealed that the substitution of Ca for Zn led to the alpha-beta pyrochlore phase transformation and pure beta pyrochlore structure were obtained. The dielectric constants (epsilon(r)) varied slightly with x increasing. The quality factor Q was significantly improved by Ca substitution. The temperature coefficient of resonant frequency (tau(f)) was negative and increased with x increasing. (Bi3xCa2-3x) (ZnxNb2-x)O-7(x=0.58) ceramic, sintered at 960 degrees C, exhibits the optimal microwave dielectric properties of epsilon(r)similar to 74, Qf value similar to 6,457 (at 4.8 GHz), and tau(f)similar to-143 ppm/degrees C.
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