(Zn,Mg)TiO_3微波介质陶瓷性能的改善

Improvement on properties of (Zn,Mg) TiO_3 microwavedielectric ceramics

采用固相反应法制备了(Zn,Mg)TiO3(ZMT)微波介质陶瓷,研究分别添加CaTiO3和BaLiBSi对ZMT陶瓷介电性能的影响。结果表明:CaTiO3和BaLiBSi均能调节ZMT陶瓷的温度系数τε值;BaLiBSi能有效降低ZMT陶瓷的烧结温度,抑制Zn2TiO4相的产生,提高所制陶瓷的微波介电性能。当添加质量分数10%的CaTiO3时,950℃烧结的(Zn1.06Mg0.12)TiO3陶瓷的τε值接近零:–6×10–6/℃。加入质量分数1.2%的BaLiBSi时,900℃烧结的(Zn1.13Mg0.048)Ti1.29O3陶瓷具有最佳的微波介电性能:εr≈24.8,Q.f=10 898 GHz,τε=17×10–6/℃。

（Zn, Mg）TiO3（ZMT） microwave dielectric ceramics were prepared by conventional solid state reaction method. The effects of CaTiO3 and BaLiBSi addition on the dielectric properties of the ZMT ceramics were investigated. The results show that CaTiO3 and BaLiBSi both can adjust the value of temperature coefficient τε The BaLiBSi additives can decrease the sintering temperature and restrain the formation of Zn2TiO4, which keeps ZMT ceramics with excellent microwave dielectric properties. （Znl.06MgoAa）TiO3 ceramics doped with mass fraction of 10% of CaTiO3 sintered at 950℃ has a ετ value near to zero： -6×10-6/℃. （Znl.13Mg0.048）Ti1.2903 doped with mass fraction of 1.2% of BaLiBSi sintered at 900 ℃exhibits the optimum microwave dielectric properties： ετ=24.8, Q·f=10898 GHz,τε=17×10-6/℃.