Reaction-Sintering Process for Ba5Nb4O15 and Sr5Nb4O15 Microwave Dielectric Ceramics and the Effect of Mg Addition

• Main Authors: ShihChung-yu, 施宗佑
• Other Authors: Yi-cheng Liou
• Format: Others
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/51194654810974985692

碩士 === 崑山科技大學 === 電子工程研究所 === 94 === Ba5Nb4O15 (BN) and Sr5Nb4O15 (SN) microwave dielectric ceramics prepared by a reaction-sintering process were investigated. The effect of Mg doping and CuO addition was also studied. In this process, the mixture of raw materials was pressed and sintered directly without any calcination involved. Single phase BN and SN could be obtained. The sintering temperature was 50~100℃ lowered by Mg doping and 100~200℃ further lowered with CuO addition. With CuO addition, 97.3% and 96% of theoretic density were found in BN for 1450℃/4h sintering and SN fore 1430℃/4h sintering, respectively. Properties εr = 36.69~45.18, Q×f = 16,086~43,878 GHz, τf = 37.6~63.2 ppm/℃ for BN based and εr = 38.08~41.69, Q×f = 8,476~13,426 GHz, τf = 25.6~50.9 ppm/℃ for SN based ceramics were obtained.