Low-temperature firing and microwave dielectric properties of (1-x) Ca5Mg4(VO4)6-xBa3 (VO4)2 temperature stable ceramics

作者：Yao, Guoguang^*; Pei, Cuijin; Ma, Hong; Xu, Jiangang; Liu, Peng^*; Zhang, Huaiwu

来源：Journal of Alloys and Compounds, 2017, 709: 234-239.

DOI：10.1016/j.jallcom.2017.03.112

• Microwave dielectric properties
• LTCC
• Vanadate
• Temperature-stable dielectrics

(1-x)Ca5Mg4(VO4)(6)-xBa(3)(VO4)(2) (0.5 <= x <= 0.7) ceramics were fabricated via the conventional solid-state reaction method. The phase composition, microstructure, and compatibility with silver were investigated using X-ray diffraction, Raman spectra and Scanning electron microscopy. The results confirmed that Ca5Mg4(VO4)(6) and Ba-3(VO4)(2) crystal phases can be well coexisted in the sintered ceramics. The temperature coefficient of resonant frequency could be tuned by the volume mixture rule of Ca5Mg4(VO4)(6) and Ba-3(VO4)(2). As for the addition of Ba-3(VO4)(2), the epsilon(r) showed to increase, while the Qxf declined. In particular, the 0.35Ca(5)Mg(4)(VO4)(6)-0.65Ba(3)(VO4)(2) composite ceramics sintered at 900 degrees C for 5 h showed excellent combinational microwave dielectric properties: epsilon(r) = 11.9, Qxf = 35 000 GHz, and tau(f) = -2 ppm/degrees C, which also exhibited good chemical compatibility with silver.

• 出版日期2017-6-30
• 单位西安邮电大学; 电子科技大学; 陕西师范大学