LI Yueming ¹ ZHANG  Bin ^1,2 ZHANG  Hua ¹ LIAO  Runhua ¹ WANG  Zhumei ¹ HONG Yan ¹

(1. School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403; 2. Zhejiang Zhengyuan

Electric Co. Ltd., Jiaxing 314003)

Abstract:The low temperature sintering behaviors and microwave dielectric properties of Ca_{0. 2} (Li_{1/ 2}Sm_{1/ 2})_{0. 8}TiO₃ (CLST-0.8)ceramics were investigated, which were added 10% CaO-B₂O₃-SiO₂ (CBS) multiplicity oxide and 4% Li₂O-B₂O₃-SiO₂-CaOAl₂O₃ (LBSCA) glass and 0~2% CuO as multiplicity sintering additives. The results indicate that with the increasing of CuO content, the bulk density, the dielectric constant εr, the product of quality factor and resonance frequency Qf value of CLST-0.8 ceramics all increase first and then decrease, the temperature coefficient of resonant frequency τf of the ceramics decreases first and then increases. The sample of CLST-0.8 with 10%CBS, 4.0%LBSCA and 1.0%CuO sintered at 900℃ for 5 h has excellent microwave dielectric properties: εr ＝58.36, Qf＝2011 GHz, τf＝3.44 ppm/℃.

Keywords:Ca_0.3(Li_1/2Sm_1/2)_0.7TiO₃, CuO, microwave dielectric ceramic, low temperature sintering