Microwave dielectric properties of temperature stable (1 − x)BaCaV2O7–xTiO2 composite ceramics
The microwave dielectric properties of (1 − x)BaCaV2O7–xTiO2 (x = 0, 0.1, 0.2, 0.4 and 0.5) ceramics prepared by the solid-state reaction route were investigated. Effects of TiO2 addition on the sintering behavior, crystal structure, microstructure, and microwave dielectric properties of BaCaV2O7 were studied. X-ray diffraction analysis indicates the coexistence of rutile TiO2 and BaCaV2O7 phase when sintered at 950 °C. Both the relative permittivity and the temperature coefficient of resonant frequency increased obviously as x value increased from 0 to 0.5. A composite ceramic 0.5BaCaV2O7–0.5TiO2 exhibited excellent microwave dielectric properties with a relative permittivity ~21.4, a high quality factor value of ~14,630 GHz and a near-zero temperature coefficient of resonant frequency of ~+4.04 ppm/°C.
KeywordsTiO2 Sinter Temperature Relative Permittivity Composite Ceramic Microwave Dielectric Property
This work was supported by Natural Science Foundation of China (Nos. 21261007, 21561008, and 51502047), the Natural Science Foundation of Guangxi Zhuang Autonomous Region (Grant No. 2012GXNSFDA053024), Project of Department of Science and Technology of Guangxi (No. 114122005-28), and Projects of Education Department of Guangxi Zhuang Autonomous Region (Nos. YB2014160, ZD2014160, and KY2015YB122).