研究了以Ca_(0.3)(Li_(0.5)Sm_(0.5))_(0.7)TiO_3(CLST-0.7)为基料,复合添加10 wt%CaO-B_2O_3-SiO_2(CBS)、4 wt%Li_2O-B_2O_3-SiO_2-CaO-Al_2O_3(LBSCA)和0～2 wt%CuO氧化物为烧结助剂的微波介质陶瓷的低温烧结行为及微波介电特性.结果表明:随着CuO添加量的增加,陶瓷体积密度、介电常数ε_r、无载品质因数与谐振频率乘积Qf值,都呈先增加后降低,频率温度系数τ_f呈降低的趋势.添加10 wt%CBS、4.0 wt% LBSCA和1.0 wt%CuO的CLST-0.7微波介质陶瓷,在900 ℃烧结5 h具有较佳的微波介电性能:ε_r ＝ 67.31,Qf ＝ 2197 GHz,τ_f＝40.28 ppm/℃.
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/℃.
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