SrTiO_3/Mg_6Ti_5O_(16)复合陶瓷的微波介电性能研究

Study on Microwave Dielectric Properties of SrTiO_3/Mg_6Ti_5O_(16) Composite Ceramics

通过传统固相烧结法制备了xSrTiO_3-(1-x)Mg_6Ti_5O_(16)微波介质陶瓷,并研究其晶体结构、显微结构及微波介电性能。xSrTiO_3-(1-x)Mg_6Ti_5O_(16)复合陶瓷主要含有MgTiO_3、SrTiO_3和Mg_6Ti_5O_(16)三相;复合陶瓷晶粒分布紧密,尺寸大小不均匀;适当增加SrTiO_3含量可以有效提高介电常数和品质因数,并使谐振频率温度系数趋于正值。1420℃烧结的3.8%SrTiO_3-96.2%Mg_6Ti_5O_(16)复合微波陶瓷可获得最佳微波介电性能:ε_r=17,Q×f=42729 GHz和τ_f=5 ppm/℃。

xSrTiO3-（ 1-x） Mg6Ti5O（16） microwave dielectric ceramics were prepared by traditional solidstate method,the crystal structure,microstructure and microwave dielectric properties were studied. The main crystal phase of xSrTiO3-（ 1-x） Mg6Ti5O（16） ceramics is SrTiO3,accompanied by a small number of addition phases MgTiO3 and Mg6Ti5O（16）. Dense microstructures were seen and grain size were not uniform in compound ceramics for all contents. Increasing SrTiO3 contents reasonably can increase the dielectric constant and the quality factor,and the temperature coefficient of resonant frequency values evolve to positive. The excellent microwave dielectric properties with εr= 17,Q × f = 42729 GHz and τf= 5 ppm/℃ were obtained for the ceramics 3. 8% SrTiO3-96. 2% Mg6Ti5O（16） sintered at 1420 ℃.