中文摘要：

采用固相反应法制备了（1-c）CaWO4-xLizWO。（O≤x≤0．14）微波陶瓷，研究了Li2WO4作为第二相对CaWO。微波陶瓷的低温烧结特性和微波性能的影响。结果表明，Li2WO4相的存在能明显降低CaWO。的烧结温度，并且随着z的增加，（1-x）CaWO4-xLi2WO4（O≤z≤0．14）陶瓷体系的最佳烧结温度降低。当x=0．1，在900℃下烧结2h，该陶瓷材料的介电常数ε1=9．002，品质因数与频率之积Q×f=11．76×10^4GHz，谐振频率温度系数r1=55×10^-6／℃。在此基础上采用w（CaTiO3）=5．0％调节其谐振频率温度系数到0，调节后的微波介电性能为ε1=10．312，Q×f=5．36×10。GHz，rr约为0

英文摘要：

The （1-x） CaWO4-xLi2 WO4 （0≤x≤0.14） microwave ceramics were prepared by the solid state re- action method. The effect of Li2WO4 as second phase on the low-temperature sintering and microwave dielectric properties of CaWO4 was investigated. The results showed that the existing LizWO4 phase can reduce the sintering temperature of CaWO4 significantly; furthermore, with x increase, the optimal sintering temperature of （1-x） Ca- WO4-xLizW04 （O≤x≤O. 14） ceramic system decreased. At x：0. 1, the （1-x） CaWO4-xLizW04 ceramics sin- tered at 900 ℃ for 2 h presented excellent microwave dielectric properties. The dielectric constant of cr is 9. 002, the Q X f is 11.76 X 104 GHz and the temperature coefficient of resonant frequency of rl is --55 × 10^6/℃. On this ba- s is,w （CaTiO3） = 5.0 % was used to adjust the temperature coefficient of resonant frequency to zero. The micro- wave dielectric properties after adjusting was εr = 10. 312 ,QX f = 5.36 × 104 GHz and rsvp.0.