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采用传统固相合成法制备了xCa0.6La0.8/3TiO3-(1-x)(Li0.5Sm0.5)TiO3(CLT-LST)系列微波介质陶瓷材料,研究了该系列微波介质陶瓷的物相结构、表面形貌、介电性能。实验发现:随着Ca0.6La0.8/3TiO3含量的增多,CLT-LST样品XRD峰轻微左移。陶瓷组成对微波介电性能影响显著,复合体系CLT-LST的微波介电性能随着x值不同而连续变化:当x从0.2上升到0.6时,介电常数(εr)逐步增大,在x=(0.40.6),εr变化趋于稳定,达到较佳值;品质因数(Q·f)则先减小后增大再迅速减小;谐振频率温度系数(τf)逐渐从负值向正值方向移动。当复合体系组成为0.4Ca0.6La0.8/3TiO3-0.6(Li0.5Sm0.5)TiO3时,在1 250℃烧结4h所得到的微波介电性能较佳,εr=125;Q·f=2 680GHz;τf=7.0×106/℃。
Abstract：Microwave dielectric ceramics of xCa0.6La0.8/3TiO3-(1-x)(Li0.5Sm0.5)TiO3(CLT-LST)were prepared by a conventional solid-state reaction method.The phases,microstructures,surface topologies and dielectric properties of the microwave ceramics were analyzed.The increase of Ca0.6La0.8/3TiO3content leads to a slight shift of diffraction peak toward low angles. The composition of microwave dielectric ceramic has an effect on the performance.The CLT-LST microwave dielectric properties change with the x value.The dielectric constant,εr,increases with increasing xfrom 0.2to 0.6.The optimum dielectric constantεris between 0.4to 0.6.The quality factor(Q·f)firstly increases and then decreases rapidly,and the temperature coefficient of resonant frequency(τf)gradually changes from negative to positive.The 0.4Ca0.6La0.8/3TiO3-0.6(Li0.5Sm0.5) TiO3ceramic sintered at 1 250℃for 4hexhibits the superior microwave dielectric properties(i.e.,εr=125,Q·f=2 680GHzandτf=7.0×106/℃).
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基本信息:
中图分类号:TQ174.1
引用信息:
[1]杨云,陈国华,袁昌来,等.Ca_(0.6)La_(0.8/3)TiO_3-Li_(0.5)Sm_(0.5)TiO_3复合微波陶瓷的介电性能[J].硅酸盐学报,2014,42(04):448-452.
基金信息:
广西信息材料重点实验室研究基金(1210908-209-Z、1210908-207-Z、1210908-05-Z);; 广西信息科学中心研究基金(20130115)项目资助
2014-04-03
2014-04-03
2014-04-03