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Nd³⁺、Li¹⁺对CaTiO₃微波介电性能的影响

Effects of Nd³⁺ and Li¹⁺ Substitutions on the Microwave Dielectric Properties of CaTiO₃

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【Author】 HUANG Guo-hua~(1,2),XIE Qing-lian~1,XU Jian-mei~2, ZHOU Dong-xiang~2 (1.Dept.of Physics and Electronic Information Science,Guangxi Teachers Education University,Nanning 530001,China;2.Dept.of Electronic Science and Technology,Huazhong University of Science and Technology,Wuhan 430074,China)

【机构】广西师范学院物理与电子信息科学系；华中科技大学电子科学与技术系；华中科技大学电子科学与技术系广西南宁530001；湖北武汉430074；广西南宁530001；

【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/℃。更多还原

【Abstract】 The effects of Nd³⁺ and Li¹⁺ substitutions on the microwave dielectric properties of CaTiO₃ were studied.The Ca_1-xNd_2x/3TiO₃（CNT） ceramics were prepared at sintering temperatures of 1 300¹ 380 ℃ by using CNT（x = 0.39） ceramics as examples.Microwave dielectric properties of ε_r = 109.24,Qf = 8 650 GHz,τ_f = +243×10^-6/℃ were obtained for CNT（x = 0.39） ceramics sintered at 1 350 ℃ for 4 h.For（1y）Ca_1-xNd_2x/3TiO₃-yLi_1/2Nd_1/2TiO₃（CNLNT） materials,CNLNT（x = 0.39,y = 0.49）ceramics were prepared at sintering temperatures of 1 200¹ 380℃ by the one step calcination method.With the increasing of the sintering temperature,the ε_r of CNLNT（x = 0.39,y = 0.49）ceramics decreased,and the τf 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 showed ε_r of 104,Qf of 3 440 GHz and τ_f of + 9 ×10^-6/℃.更多还原