Ce^3+掺杂对0.65CaTiO 3-0.35LaAlO3陶瓷微波介电性能的影响  

Effect of Ce^3+ Doping on 0.65CaTiO-0.35LaAlO Microwave Dielectric Ceramics

作　　者：罗捷宇 李月明 李志科 王竹梅 洪燕 沈宗洋 LUO Jieyu;LI Yueming;LI Zhike;WANG Zhumei;HONG Yan;SHEN Zongyang(School of Materials Science and Engineering,Jingdezhen Ceramic Institute,China National Light Industry Key Laboratory of Functional Ceramic Materials,Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi Province,Jingdezhen 333403,Jiangxi,China)

机构地区：[1]景德镇陶瓷大学材料科学与工程学院,中国轻工业功能陶瓷材料重点实验室,江西省能量存储与转换陶瓷材料工程实验室,江西景德镇333403

出　　处：《硅酸盐学报》2020年第9期1383-1389,共7页Journal of The Chinese Ceramic Society

基　　金：江西省科技落地计划(KJLD12084)。

摘　　要：以EDTA为络合剂,采用聚合物前驱体法合成了0.65CaTiO3-0.35(La1-xCex)AlO3(CTLCA-x)微波介质陶瓷。研究了Ce^3+取代La^3+对陶瓷微波介电性能、显微结构以及晶体结构的影响。结果表明:采用聚合物前驱体法合成的CTLCA-x陶瓷,相比于传统固相法,烧结温度降低了125℃左右,在所研究的组成范围内均能形成正交相固溶体,随着Ce^3+掺杂量x的逐渐增加,单位晶胞体积减小,陶瓷的品质因数Q×f和介电常数εr均增加,但频率温度系数τf下降。当x=0.2时,CTLCA-0.2陶瓷在1 325℃保温3 h烧结后具有最佳的微波介电性能:εr=42.7,Q×f=39 159 GHz,τf=-7×10^-6/℃。0.65CaTiO3-0.35(La1-xCex)AlO3(CTLCA-x) microwave dielectric ceramic was successfully synthesized by the polymeric precursor method using EDTA as a chelating agent.The effects of Ce^3+ion doping on the microwave dielectric properties,microscopic structure and crystal structure were studied.The result indicated that the sintering temperature of CTLCA-x ceramic prepared by polymer precursor method was decreased by about 125℃compared with conventional mixed solid method,a single orthorhombic phase for all the compositions can form and the unit cell volume increases linearly with the doping content x.Ce^3+ion dopant can increased the quality factor and dielectric constant,but the temperature coefficient of resonant frequency decreased.When x=0.2,the optimal microwave dielectric properties ofεr=42.7,Q×f=39 159 GHz,and τf=-7×10^-6/℃for the CTLCA-0.2 ceramics could be obtained,which sintered at 1 325℃for 3 h.

关 键 词：微波介质陶瓷 聚合物前驱体法 高品质因数 铈离子取代 

分 类 号：TU528[建筑科学—建筑技术科学]