Nd^(3+)、Li^(1+)对CaTiO_3微波介电性能的影响  

Effects of Nd^(3+) and Li^(1+) Substitutions on the Microwave Dielectric Properties of CaTiO_3

作　　者：黄国华[1] 谢清连[1] 徐建梅[2] 周东祥[2] 

机构地区：[1]广西师范学院物理与电子信息科学系,广西南宁530001 [2]华中科技大学电子科学与技术系,湖北武汉430074

出　　处：《压电与声光》2006年第2期185-187,共3页Piezoelectrics & Acoustooptics

基　　金："十五"国家高技术研究发展计划("八六三"计划)基金资助项目(2001AA-ZB3201);教育部科学技术研究重大基金资助项目(重大0206)

摘　　要：研究了Nd3+、Li1+取代对CaTiO3微波介电性能的影响。以x=0.39的Ca1-xNd2x/3TiO3(CNT)为典型材料,在1 300~1 380℃烧结制备CNT。在1 350℃烧结4 h,可制备出介电常数rε=109.24,品质因数与频率之积Qf=8 650 GHz,谐振频率温度系数τf=+243×10-6/℃的CNT(x=0.39)微波陶瓷。对于(1-y)Ca1-xNd2x/3TiO3-yLi1/2Nd1/2TiO3(CNLNT),采用一步预合成法在1 200~1 380℃烧结制备CNLNT(x=0.39,y=0.49)微波陶瓷。随着烧结温度的提高,CNLNT(x=0.39,y=0.49)陶瓷的rε下降,τf略有下降。当烧结温度超过1 300℃时,Qf值下降。在1 300℃烧结4 h,rε=104,Qf=3 440 GHz,τf=+9×10-6/℃。The effects of Nd^3＋ and Li^1＋ substitutions on the microwave dielectric properties of CaTiO3 were studied. The Ca1-xNd2x/3TiO3 （ CNT ） ceramics were prepared at sintering temperatures of 1 300～1 380 ℃ by using CNT（ x = 0.39 ） ceramics as examples. Microwave dielectric properties of εr= 109.24,Qf = 8 650 GHz,τf= ＋ 243×10^-6/℃ were obtained for CNT（ x = 0.39 ） ceramics sintered at 1 350 ℃ for 4 h. For（1-y）Ca1-xNd2x/3 TiO3-yLi1/2 Nd1/2 TiO3 （CNLNT） materials,CNLNT（x = 0.39,y = 0.49） ceramics were prepared at sintering tem- peratures of 1 200～1 380℃ by the one step calcination method. With the increasing of the sintering temperature, the e, of CNLNT（x = 0.39,y = 0.49）ceramics decreased, and the rf of which decreased slightly. When the sintering temperature is over 1 300 ℃, Qf value of CNLNT（x = 0.39,y = 0.49）ceramics decreased. The CNLNT（x = 0.39,y = 0.49）ceramics sintered at 1 300 ℃ for 4 h showede εr of 104,Qf of 3 440 GHz and τf of ＋ 9 × 10＆-6/℃.

关 键 词：CATIO3 微波介质陶瓷 介电性能 

分 类 号：TN604[电子电信—电路与系统]