1 China Key System & Integrated Circuit Co., Ltd., Wuxi 214072, Jiangsu, China 2 College of Material Science & Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Abstract: The influence of the substitution of Sr2+ for Ca2+ on the sintering characteristics, phase composition, microstructure and microwave dielectric properties of Ca1-xSrxMgSi2O6 ceramics was investigated. The results showed that the substitution of Sr2+ can lower the sintering temperature and improve the density of ceramics. When the Sr2+ substitution amount was less than or equal to 0.5, only a single CaMgSi2O6 phase existed in the ceramics. With the increase of Sr2+ content, the dielectric constant and quality factor of Ca1-xSrxMgSi2O6 ceramics both increased first and then decreased, while the temperature coefficient of resonance frequency gradually increased. Ca0.6Sr0.4MgSi2O6 ceramics sintered at 1 225 ℃ for 4 h showed superior comprehensive microwave dielectric properties: εr=7.480, Q×f=78 920 GHz, τf=-41.50×10-6/℃.
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