Ca_(1-3x)Ln_(2x)TiO_3(x=0.13,0.2;Ln=La,Nd,Sm)高介微波介质陶瓷

Ca_(1-3x)Ln_(2x)TiO_3(x=0.13,0.2;Ln=La,Nd,Sm):High ε Microwave Dielectric Ceramics

探讨了烧结温度、组成和稀土元素对Ca1-3xLn2xTiO3(x=0.13,0.2:Ln=La,Nd,Sm)陶瓷的晶体结构、微波介电性能的影响。X射线衍射(XRD)分析表明,除Ca1-3xLn2xTiO3(x=0.2;Ln=Sm)陶瓷中含有少量的第二相(Sm2Ti2O7)外,其余Ca1-3xLn2xTiO3(x=0.13,0.2;Ln=La,Nd,Sm)陶瓷均形成了单一正交钙钛矿相。x=0.13的样品微波介电性能明显优于相应的x=0.2的样品。部分Ca1-3xLn2xTiO3(x=0.13,0.2;Ln=La,Nd,Sm)陶瓷微波介电性能如下:ε=119.6、Qf=10674GHz、τf=304.4×10-6/℃(x=0.13、Ln=La);ε=108.9、Qf=14919GHz、τf=236.2×10-6/℃(x=0.13、Ln=Nd);ε=101.3、Qf=14485GHz、τf=186.6×10-6/℃(x=0.13、Ln=Sm)。

The effects of sintered temperature, composition and rare earth ions on the crystal structure and microwave dielectric properties of Ca1-3xLn2xTiO3（x=0.13, 0.2; Ln=La, Nd, Sm） ceramics were investigated. From the X-ray diffraction patterns, orthorhombic perovskite phase was formed in Ca1-3xLn2xTiO3（x=0.13, 0.2; Ln=La, Nd, Sm） ceramics, while the secondary phase Sm2Ti2O7 was formed in Ca1-3xLn2xTiO3（x=0.2; Ln=Sm） ceramic. The microwave dielectric properties of the samples at x=0.13 are better than that of the samples at x=0.2. Ca1-3xLn2xTiO3（x=0.13, Ln=La, Nd, Sm） ceramics display the microwave dielectric properties as follows： ε=119.6, Qf=1 0 674 GHz, rf=304.4×10^-6/℃ for Ln=La; ε=108.9, Qf=14 919GHz, τf=236.2×10^-6/℃ for Ln=Nd; ε=101.3, Qf=14 485GHz, τf=186.6×10^-6/℃ for x=0.13, Ln =Sm.