Structure and Dielectric Properties of Non-stoichiometric Bi₂O₃-ZnO-Nb₂O₅ Ceramics

Abstract

Bi-based ceramics with pyrochlore structure exhibit interesting microwave dielectric properties such as high dielectric constant and low firing temperature. Structure and dielectric properties of non-stoichiometric ceramics Bi _1.5 ZnNb _{1.5− x} O _7−2.5x (x = −0.344∼0.13) were investigated. Dielectric properties are usually proportional to the polarizability of the constituents. The experimental results show that dielectric constant increase linearly the x value. The dielectric relaxation and defect resulting from non-stiochiometric ceramics Bi _1.5 ZnNb _{1.5− x} O _{7−2.5 x} were discussed.

Keywords:

• Dielectric relaxation
• cubic pyrochlore
• non-stoichiometric

Acknowledgments

This work was supported by the Ministry of Science and Technology of China through 973-project under grant 2002CB613302