摘要
研究了烧结温度、组成和稀土元素对(1-x)CaTiO3-x(Li1/2Ln1/2)TiO3(x=0.3、0.5(摩尔分数);Ln=La、Nd、Sm)微波介质陶瓷的晶体结构和微波介电性能的影响。X-射线衍射(XRD)分析表明,除(1-x)CaTiO3-x(Li1/2Ln1/2)TiO3(x=0.5,Ln=Nd)陶瓷中含有少量Nd2Ti2O7外,其余陶瓷均形成了单一的正交钙钛矿相。x=0.5的样品微波介电性能明显优于相应的x=0.3的样品。(1-x)CaTiO3-x(Li1/2Ln1/2)TiO3(x=0.5)陶瓷微波介电性能:介电常数ε=160,品质因数与频率之积Qf=1 200 GHz,频率温度系数τf=-97×10-6/℃(Ln=La);ε=129,Qf=2 000 GHz,fτ=-52×10-6/℃(Ln=Nd);ε=118,Qf=2 305 GHz,τf=-45×10-6/℃(Ln=Sm)。
The effects of sintered temperature, composition and rare earth ions on the crystal structure and mi- crowave dielectric properties of （ 1--x）CaTiOa-x（Li1/2Lnl/2 ） TiO3（x：O. 3, 0.5; Ln=La, Nd, Sin） ceramics were investigated. From the X ray diffraction patterns, orthorhombic perovskite phase was formed in ceramics, while the second phase Nd2 Ti2O7 was formed in （ 1--x）CaTiOa-x（Li1/2Lnl/2 ） TiO3（x = 0.5 ; Ln = Nd） ceramic. The micro- wave dielectric properties of the samples at x=0.5 are better than that of the samples at x=0.3. （ 1--x）CaTiOa-x（Li1/2Lnl/2 ） TiO3 （x = 0.5 ; Ln = La, Nd, Sin） ceramics display the microwave properties as follows ： E = 160, Q f= 1 200 GHz,rf=--97×10-6/℃ for Ln--La;ε=129,Qf=2 000 GHz,rf=-52×10-6/℃ for Ln=Nd;E=ll8, Qf=2 305 GHz,ri=--45 ×10-6/℃ for Ln=Sm.
出处
《压电与声光》
CSCD
北大核心
2010年第2期284-286,共3页
Piezoelectrics & Acoustooptics
