Cadmium substituted (Bi1.5ZnNb1.5)O7 dielectric ceramics
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The effects of small amounts of Cd substitution for Zn in the low loss dielectric material Bi1.5ZnNb1.5O7 are reported. Solid solution of (Bi1.5Zn0.5-xCdx)(Zn0.5Nb1.5)O7 was formed in the present ceramics for x < 0.1, and β-Bi2O3 secondary phase appeared at x = 0.3. For x = 0.5, another phase Bi1.6Cd0.4O2.8 appeared gradually with increasing x. With increasing x, the dielectric constant increased firstly and reached their maximums 168 at 1 MHz, then decreased after x > 0.2. High-ɛ dielectric ceramics with low dielectric loss were created at the composition x = 0.2: ɛ = 168, \(\tan\delta=0.0001\) and αɛ = − 554 ppm/° at 1 MHz.
KeywordsDielectric Constant Dielectric Property Bi2O3 Temperature Coefficient Pyrochlore Structure
This work was supported by the Ministry of Science and Technology of China through 973-project (2002CB613302), China Postdoctoral Science Foundation (2005037018) and the Nature Science Project of education department of Shaanxi Province (04JK226).
- 8.Du H, Yao X (2004) Mater Sci Mater El 15:613Google Scholar