Phase Structure and Dielectric Properties of Bi 2 O 3 ‐ZnO‐Nb 2 O 5 ‐Based Dielectric Ceramics

Phase structures and dielectric properties of the compounds with formulas BixZn 2/3 Nb 4/3 O 4+3x/2 (group M), Bi x Zn 8/3‐x Nb 4/3 O 6+x/2 (group V), and Bi x Zn 2‐2x/3 Nb 2‐x/3 O 7 (group W) have been investigated. Initial results indicate that a cubic pyrochlore structure is the predominant phase of these compound. Most of the measured ceramic specimens exhibit dielectric properties suitable as temperatures‐stable and temperature‐compensating dielectrics in the capacitor industry. The values of the dielectric constant K are 80‐160, while those of the temperature coefficient are–500 to + 160 ppm/°C. The composition limits of the single pyrochlore phase are determined mainly by Bi 2 O 3 additives.