添加TiO_2对0.94 ZnTiNb_2O_8-0.06 BaCu(B_2O_5)材料的物相组成及介电性能的影响

Effects of TiO_2 additives on phase composition and dielectric properties of 0.94ZnTiNb_2O_8-0.06BaCu(B_2O_5) materials

采用传统固相反应法制备了(1–x)(0.94ZnTiNb_2O_8-0.06Ba Cu(B_2O_5))-xTiO_2(0.038≤x≤0.091)微波介质陶瓷,研究了不同含量TiO_2添加对0.94ZnTiNb_2O_8-0.06BaCu(B_2O_5)(0.94ZTN-0.06BCB)陶瓷烧结特性、相结构、微观形貌以及微波介电性能的影响。结果表明:(1–x)(0.94ZTN-0.06BCB)-x TiO_2陶瓷均由ZnTiNb_2O_8和Zn_(0.17)Ti_(0.5)Nb_(0.33)O_2相组成,随着TiO_2含量的增加,陶瓷的烧结温度、εr和τf增加,ρ和Q·f降低。烧结温度为880℃时,0.926(0.94ZTN-0.06BCB)-0.074TiO_2陶瓷表现出了优良的综合性能:εr=40.25,Q·f=32 000 GHz(5.89 GHz),τf=–3.86×10–6℃–1。且在此温度下介质材料与Ag电极兼容性良好,表明该材料是制备LTCC器件的备选材料。

(1–x)(0.94ZnTiNb2O8-0.06BaCu(B2O5))-xTiO2(0.038≤x≤0.091)microwave dielectric ceramics were prepared by the solid state reaction method.The effects of TiO2 addition on the sintering behavior,phase structure,microstructure and microwave dielectric properties of 0.94ZnTiNb2O8-0.06BaCu(B2O5)(0.94ZTN-0.06BCB)ceramics were studied.The results show that(1–x)(0.94ZTN-0.06BCB)-xTiO2 ceramics are made up of ZnTiNb2O8 and Zn0.17Ti0.5Nb0.33O2 phases.With increasing TiO2 content,the sintering temperature,εr andτf increase,while theρand Q·f decrease.0.926(0.94ZTN-0.06BCB)-0.074TiO2 ceramic shows excellent comprehensive performance with sintering temperature of 880℃:εr=40.25,Q·f=32 000 GHz(5.89 GHz)andτf=–3.86×10–6℃–1.The dielectric sintered at 880℃shows good chemical compatibility with silver electrodes,indicating that the material could be alternative to fabricated LTCC devices.