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1、西北工业大学硕士学位论文ABSTRACTBriefreviewsonthetheory,backgroundandsignificanceofPiezocearmicsarebeingmadeatthebeginningofthisthesis.Basedonthis,severalsupplementaryguidelinesaregivenoutinthecompositiondesign.AserialofPZN-PZTbasedpiezoceramicsampleswithdiferentZr/Tiratiosaresynthesizedby
2、adoptingthetwo-stepmethod.TheinfluencethattheZr/Tiratioshaveontheceramiccrystalstructureanditspropertiesarestudiedthroughtheresearchcarriedoutabouttherelativerespectsofthefabricatedsamples.TheincreaseofZr/Tiratiocanresultinthecrystalstructuretransformationfromthetetragonaltothe
3、rhombohedral,itcanalsoinducetheweaknessinthestabilityoftheceramiccrystalstructure,forexample,thedropintheCurieTemperature.InordertoenhancetherelativelowmechanicalqualityfactorofPZN-PZTsystempiezoceramics,componentadditionPb(Mn1/3Sbv3)03(hereafterabbreviatedasPMS)areintroducedin
4、toformanewpsudo-tetragonalsystemceramics.Ithasbeenfoundthatalltheelementsintheadditionactrespectivelyinthewaythatafectthematerial'spropertiesduringthecalciningprocessandtheincreaseofthePMS/PZNratiocanweakenthestabilityofthecrystalstructureofthesinteredceramicsandcausethecrystal
5、structuretransformationfromthetetragonaltotherhombohedralaswell.SmallamountofNb,MndopantscouldbringhightheQmfactorofPMS-PZN-PZTbasedceramic,socanitbringdownthestabilityofthematerialcrystalstructure.Togoastepfurther,iftheCcdopantisintroduced,itmaydeterioratepropertiesfromallresp
6、ectsexceptforahigherdensity.ThesamplewithanoptimizedcompositionisfabricatedinPMS-PZN-PZTceramicsystem,anditshowsthebestgeneralproperties:p7.84g/cm3,‘1295tans=0.0038,d33=304,Kp=0.62,Qm=1220,Tc300"C.KEYWORDS:Piezoceramics,relativequantity,microstructure,property,doping主要符号表主要符号表K
7、p:机电a合系数(径向振动模式)Qm:机械品质因数Qe:电学品质因数相对介电常数tan8:介电损耗d33:压电常数夕:谐振频率fa:反谐振频率Tc斤;谐振频率温度系数XRD:X射线衍射SEM:扫描电子显微镜EDS:能谱分析PZT:Pb(ZrTi)03错钦酸铅PZN:Pb(Zn1,3Nbv3)03,妮锌酸铅PMS:Pb(Mnii3Sb2/3)03，锑锰酸铅PT:PbTi03l钦酸铅PZ:PbZr03,错酸铅Pero:钙钦矿相Pyro:焦绿石相第一章绪论第一章绪论1.1研究的背景及意义压电材料是在上个世纪，尤其是在上个世纪后半叶发展进来的一种新型功能材料
8、。压电陶瓷材料是压电材料的重要的组成部分。从应用方面可以将压电陶瓷及器件分为七大类:①压电振子及材料;②压电
