钡镧钛系列高介电常数陶瓷研究  

Study on barium lanthanum titanium series high permittivity ceramics

作　　者：张红霞 周世良 冯庆学 

机构地区：[1]冀中能源邢矿硅业科技有限公司,河北邢台054000

出　　处：《电子元件与材料》2012年第1期12-14,共3页Electronic Components And Materials

摘　　要：采用固相烧结法制备了BaO-La2O3-nTiO2(n=3,4,5和6,BLT)微波介质陶瓷。研究了TiO2含量以及添加Bi2O3和SrTiO3对所制BLT陶瓷的微观结构及介电性能的影响。结果表明:当n=4时,BLT陶瓷晶体结构致密。当n=5并添加Bi2O3和SrTiO3进行改性,所制BLT陶瓷的相对介电常数εr从93增大到210,介质损耗tanδ从2.5减小到1.2,电容温度系数αc向负方向移动。The BaO-La2O3-nTiO2（n= 3, 4, 5 and 6, BLT） microwave dielectric ceramics were prepared by the solid state reaction method. The effects of the content of TiO2 as well as adding Bi2O3 and SrTiO3 on the microstructure and dielectric properties of the prepared BLT ceramics were studied. The results show that the crystal structure of prepared BLT ceramic is dense at n=4. The relative permittivity of BLT ceramics increases from 93 to 210, dielectric loss decreases from 2.5 to 1.2, and the temperature coefficient of capacitance （ac） moves towards the negative direction at n=5 by adding the Bi2O3 and SrTiO3.

关 键 词：微波介质陶瓷 钡镧钛 介电性能 

分 类 号：TM28[一般工业技术—材料科学与工程]