MgF_(2)掺杂对0.95MgTiO_(3)-0.05CaTiO_(3)陶瓷结构与微波性能的影响  

Effects of MgF_(2) doping on structure and microwave property of 0.95MgTiO_(3)-0.05CaTiO_(3) ceramics

作　　者：冉文 刘凡 李昊 刘绍军[1] RAN Wen;LIU Fan;LI Hao;LIU Shaojun(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2023年第3期253-261,共9页Materials Science and Engineering of Powder Metallurgy

基　　金：湖南省自然科学基金资助项目(2021JJ30831)。

摘　　要：采用传统固相合成法制备Mg F_(2)掺杂0.95MgTiO_(3)-0.05CaTiO_(3)(95MCT)微波陶瓷,结合X射线衍射谱、拉曼光谱、X射线光电子能谱、扫描电镜及矢量网络分析等表征技术,系统研究Mg F_(2)掺杂对95MCT陶瓷烧结温度、晶体结构、微观形貌与微波性能的影响。结果表明:少量Mg F_(2)掺杂能够促进陶瓷晶粒均匀生长,抑制Ti^(4+)离子向Ti^(3+)离子转变,增强[TiO_(6)]八面体中Ti—O键的结合强度,从而使95MCT陶瓷的品质因子由30 335 GHz提高至89 470 GHz。1 225℃烧结的Mg F_(2)质量分数为1%的95MCT陶瓷具有优异的综合微波性能:相对介电常数ε_(r)约为19.74,品质因子Q×f值约为89 470 GHz,谐振频率温度系数τ_(f)约为-10.2×10^(-6)℃^(-1)。MgF_(2) doped 0.95MgTiO_(3)-0.05CaTiO_(3)(95MCT)microwave ceramics were synthesized by solid-phase reaction.The effects of MgF_(2) doping on the sintering temperature,crystal structure,microstructure and microwave properties of 95MCT ceramics were characterized by X-ray diffraction,Raman spectroscopy,X-ray photoelectron spectroscopy,scanning electron microscopy and vector network analyzer.The results show that a small amount of MgF_(2) doping can promote the uniform growth of ceramic grains.The addition of MgF_(2) inhibits the transition of Ti^(4+)ions to Ti^(3+)ions and enhances the Ti—O bonding strength of[TiO_(6)]octahedra,thus significantly improving the quality factor of ceramics from 30335 GHz to 89470 GHz.MgF_(2) doped with 1%(mass fraction)of 95MCT ceramic sintered at 1225℃has excellent microwave properties:the relative permittivityε_(r) is about 19.74,the Q×f value is about 89470 GHz,and the resonant frequency temperature coefficientτ_(f) is about−10.2×10^(−6)℃^(−1).

关 键 词：MgTiO_(3)-CaTiO_(3)陶瓷 MgF_(2)掺杂 [TiO_(6)]八面体 烧结温度 微波性能 

分 类 号：TB34[一般工业技术—材料科学与工程]