Sintering Behavior and Dielectric Properties of Bi3NbO7 Ceramics Prepared by Mixed Oxides and High-Energy Ball-Milling Methods
Abstract:The sintering behavior and dielectric properties of Bi3NbO7 ceramics prepared by the high-energy ball milling (HEM) method and conventional mixed oxides method with V2O5 addition were investigated. All the samples were sintered between 840° and 960°C. For the ceramics prepared by the mixed oxides method, the pure tetragonal Bi3NbO7 phase formed without any cubic phase. With changing sintering temperature, the dielectric constant r lies between 79 and 92, while the Q×f values are between 300 and 640 GHz. The samples sintered at 870°C have the best microwave dielectric properties with r=79, Q×f=640 GHz, and the temperature coefficients of resonant frequency f between 0 and −20 ppm/°C. For the ceramics prepared by the HEM, a pure cubic phase was obtained. The r changes between 78 and 80 and Q×f were between 200 and 290 GHz.
Document Type: Research Article
Affiliations: Electronic Research Materials Laboratory, Key Laboratory of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China
Publication date: January 1, 2007