La(Mg1/2Ti1/2)O3(LMT) doped CaTiO3(CT) ceramic materials prepared by using the traditional process possess lower relative permittivity εr and quality factor Qf in the manufacturing process of microwave dielectric ceramic filter.New CaTiO3 composite ceramic materials modified by La(Mg1/2Ti1/2)O3 and La(Zn1/2Ti1/2)O3(LZT) were obtained. These materials not only replace the lead based microwave ceramic materials,but also possess excellent relative permittivity εr and quality factor Qf. The results reveal that when the x and y values are located at the range of 0.20≤x≤0.60,0.40≤y≤0.70, respectively,the(1–y)CaTiO3+yLa(Zn(1–x)/2Mgx/2Ti1/2)O3 microwave dielectric ceramic materials possess good relative permittivity(εr≥55), quality factor (Qf≥40000) and temperature coefficient of frequency (τf≤±100×10–6℃–1).%采用传统陶瓷工艺制备的钛酸钙、钛镁酸镧体系(CT+LMT)在微波介质陶瓷滤波器的制造中存在相对介电常数εr及品质因数Qf不够理想的问题,为得到具有更优εr值和Qf值的微波陶瓷材料,同时取代高介含铅微波陶瓷材料,研究了在CT+LMT系材料的基础上,通过掺入钛锌酸镧(LZT)改性,形成CT+LMT+LZT新材料体系,同时改进工艺获得了更高的相对介电常数和品质因数.结果表明:(1–y)CaTiO3+yLa(Zn(1–x)/2Mgx/2Ti1/2)O3系材料,当0.20≤x≤0.60,0.40≤y≤0.70时能获得相对介电常数εr≥55,品质因数Qf≥40000,频率温度系数τf≤±100×10–6℃–1的微波介质陶瓷材料.
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