硅酸盐学报

Ca_0.6La_0.8/3TiO₃Li_0.5Sm_0.5TiO₃复合微波陶瓷的介电性能

作者：杨云1 2 陈国华1 2 袁昌来1 周昌荣1

关键词：复合钙钛矿微波介质陶瓷介电性能

分类号：TB34

出版年,卷(期):页码：2014,42(4):448-452

DOI：10.7521/j.issn.0454－5648.2014.04.05

摘要：

采用传统固相合成法制备了xCa0.6La0.8/3TiO3(1x) (Li0.5Sm0.5)TiO3(CLTLST)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，CLTLST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CLTLST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＝(0.4～0.6)，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0.4Ca0.6La0.8/3TiO30.6(Li0.5Sm0.5)TiO3时，在1250℃烧结4h所得到的微波介电性能较佳，εr＝125；Q·f＝2680GHz；τf＝7.0×106/℃。

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 Ca0.6La0.8/3TiO3 content 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 x from 0.2 to 0.6. The optimum dielectric constant εr is between 0.4 to 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)TiO3 ceramic sintered at 1250℃ for 4 h exhibits the superior microwave dielectric properties (i.e., εr＝125, Q·f＝2680GHzandτf＝7.0×106/℃)．

基金项目：

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。

作者简介：

第一作者：杨云(1979—)，男，硕士，讲师。

参考文献：

［1］杨辉,张启龙,王家邦,等. 微波介质陶瓷及器件研究进展［J］.硅酸盐学报.2003,31(10):965-980.
YANG H, ZHANG Q L, WANG J B, et al. J Chin Ceram Soc. 2003, 31(10): 965-980.
［2］宋英, 王富平, 周玉. 微波介质陶瓷材料的研究进展［J］. 材料科学与工艺. 1998, 6(2): 51-64.
SONG Y, WANG F P, ZHOU Y. Mater Sci Technol(in Chinese), 1998, 6(2): 51-64.
［3］王浩,陈文, 刘涛.(1-y)Ca1-xLa2x/3TiO3-yCa(Mg1/3Nb2/3)O3复合体系的微波介电性能［J］. 硅酸盐学报, 2004, 32(7): 880-883.
WANG H,CHEN W,LIU T. J Chin Ceram Soc, 2004, 32(7): 880-883
［4］KELL R C, GREENHAM A C, OLDS G C E. High-permittivity temperature-stable ceramics dielectrics with low microwave loss［J］. J Am Ceram Soc, 1973, 56(7): 352-354.
［5］HANG C L. TSAI J T, CHEN Y B. Dielectric properties of (l-y) Ca1-xTiO3-y(Li,Nd)1/2TiO3 ceramics system at microwave frequency[J]. Mater Res Bull, 2001, 36(3-4)547-556.
［6］YOSHIDA M, HARA M N, TAKADA T, et al. Structure and dielectric properties of Ca1-xNd2x/3Ti03\[J\]. JPn J Appl Phys, 1997, 36: 6818-6823.
［7］KIM W S, KIM E S, YOON K H. Effects of Sm3+ substitution on dielectric properties or of Ca(1-x)Sm2x/3TiO3 ceramics at microwave frquencies[J]. J Am Ceram Soc, 1999, 82(8): 2111-2115.
［8］HUANG Chengliang,TSAI Jsung Ta,CHEN Yuanbin. Dielectric properties of (1-y) Ca1-xLa2x/3TiO3-y(Li,Nd)1/2TiO3 ceramic system at microwave frequency\[J\]. Mater Res Bull, 2001(36): 547-556.
［9］UBIC R., REANEY I M, LEE W E. Microwave dielectric solid-solution phase in system BaO-Ln2O3-TiO2(Ln=Lanthanide caution)\[J\]. Int Mater Rev, 1998, 43(5): 205-219.
［10］KIM EUNG SOO, YOON KI HYUN. Microwave dielectric properties of (1-x)CaTiO3-xLi1/2Sm1/2TiO3 ceramics\[J\].J Eur Ceram Soc, 2003, 24(14): 2397-2410.
［11］YOON KI HYUN,KIM WOO SUP,KIM EUNG SOO. Dependence of the octahedral bond valence on microwave dielectric properties of Ca1-xSm2x/3TiO3 ceramics\[J\]. Mater Sci Eng B, 2003, 99(1-3): 112-115
［12］KIM E S, CHUN B S, YO D W, et al. Microwave dielectric properties of (l-x)Ca0.7Nd0.2TiO3-x(Li0.5Nd0.5)TiO3 ceramics\[J\].Mater Sei Eng B, 2003, 99(1-3): 243-246.

服务与反馈：

【文章下载】【加入收藏】