第28卷第3期粉末冶金材料科学与工程2023年6月Vol.28No.3MaterialsScienceandEngineeringofPowderMetallurgyJun.2023DOI:10.19976/j.cnki.43-1448/TF.2023022MgF2掺杂对0.95MgTiO3-0.05CaTiO3陶瓷结构与微波性能的影响冉文，刘凡，李昊，刘绍军(中南大学粉末冶金国家重点实验室，长沙410083)摘要：采用传统固相合成法制备MgF2掺杂0.95MgTiO3-0.05CaTiO3(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MgF2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MgF2掺杂能够促进陶瓷晶粒均匀生长，抑制Ti4+离子向Ti3+离子转变，增强[TiO6]八面体中Ti—O键的结合强度，从而使95MCT陶瓷的品质因子由30335GHz提高至89470GHz。1225℃烧结的MgF2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εr约为19.74，品质因子Q×f值约为89470GHz，谐振频率温度系数τf约为−10.2×10−6℃−1。关键词：MgTiO3-CaTiO3陶瓷；MgF2掺杂；[TiO6]八面体；烧结温度；微波性能中图分类号：TB34文献标志码：A文章编号：1673-0224(2023)03-253-09EffectsofMgF2dopingonstructureandmicrowavepropertyof0.95MgTiO3-0.05CaTiO3ceramicsRANWen,LIUFan,LIHao,LIUShaojun(StateKeyLaboratoryofPowderMetallurgy,CentralSouthUniversity,Changsha410083,China)Abstract:MgF2doped0.95MgTiO3-0.05CaTiO3(95MCT)microwaveceramicsweresynthesizedbysolid-phasereaction.TheeffectsofMgF2dopingonthesinteringtemperature,crystalstructure,microstructureandmicrowavepropertiesof95MCTceramicswerecharacterizedbyX-raydiffraction,Ramanspectroscopy,X-rayphotoelectronspectroscopy,scanningelectronmicroscopyandvectornetworkanalyzer.TheresultsshowthatasmallamountofMgF2dopingcanpromotetheuniformgrowthofceramicgrains.TheadditionofMgF2inhibitsthetransitionofTi4+ionstoTi3+ionsandenhancestheTi—Obondingstrengthof[TiO6]octahedra,thussignificantlyimprovingthequalityfactorofceramicsfrom30335GHzto89470GHz.MgF2dopedwith1%(massfraction)of95MCTceramicsinteredat1225℃hasexcellentmicrowaveproperties:therelativepermittivityεrisabout19.74,theQ×fvalueisabout89470GHz,andtheresonantfrequencytemperaturecoefficientτfisabout−10.2×10−6℃−1.K...
