Abstract: The low temperature sintering process and the microwave dielectric properties of a microwave dielectric material based on Ca_(0.3)(Li_(0.5)Sm_(0.5))_(0.7)TiO_3(CLST-0.7) ceramic with 10 wt % CaO-B_2O_3-SiO_2 (CBS) multiplicity oxide and 4 wt % Li_2O-B_2O_3-SiO_2-CaO-Al_2O_3 (LBSCA) glass and 0-2 wt% CuO multiplicity additives were investigated. The results indicate that with the increasing of CuO content, the bulk density, the dielectric constant ε_r, the product of quality factor and resonance frequency Qf value of CLST-0.7 ceramics all increase first and then decrease and the temperature coefficient of resonant frequency τ_f of CLST ceramics decrease. The sample of CLST with 10 wt% CBS, 4.0 wt% LBSCA and 1.0 wt% CuO sintered at 900 ℃ for 5 h exhibits excellent microwave dielectric properties:ε_r＝67.31,Qf＝2197 GHz,τ_f＝40.28 ppm/℃.

Key words: Ca_(0.30(Li_(0.5)Sm_(0.5))_(0.7)TiO_3;CaO-B_2O_3-SiO_2;Li_2O-B_2O_3-SiO_2-CaO-Al_2O_3;CuO;microwave dielectric ceramic;low temperature sintering