先驅(qū)體法制備鋯鈦酸鉛基壓電陶瓷的工藝和性能的研究.pdf

1、天津大學(xué)博士學(xué)位論文先驅(qū)體法制備鋯鈦酸鉛基壓電陶瓷的工藝和性能的研究姓名：郭向華申請學(xué)位級別：博士專業(yè)：微電子學(xué)與固體電子學(xué)指導(dǎo)教師：吳霞宛20031201ABSTRACTReactionmechanismandprocessingofPZTbasedceramicspreparedbyB—siteprecursormethodwerestudiedbyusinganalysismethodssuchasXRD，SEM，BETinthi

2、spaperBythismethod，PZT／Zr02compositesaresynthesizedandeffectofZr02contentonmechanicalandpiezoelectricpropertiesofcompositeswasinvestigatedPMS—PZ—PTternarysystemwithstrontium(orbarium)substitutingwasformedbydoubleprecurso

3、rmethod，whichcomposition，phasestructureandpropertieswereincludedZTDhasereactswithPbOformingPZTphasewithoutintermediatephasessuchasPbTi03orPbZr03whenPZTissynthesizedbyprecursormethodItisfoundforthatunstableperovskitePZTph

4、asewithAsitedeficientofPbinreactiveprocessingThisreactionrateiscontrolledbypb2diffusioninformingPZTphase，whichismatchedforJandermodelonsolidstatereactionSubmicrometerpowderisachievedbyconventionallyballmillingFinegrainPZ

5、T／Zr02compositesareformedbymetastablesolidsolutionswithperovskitestructuresynthesizedbyB—siteprecursormethodForZr02contentswithin8m01％mechanicalpropertiesincreaseWithZr02contents，whilepiezoelectricanddielectricproperties

6、arealmostunchangedDuringcoolingprocedure，Zr02particlesprecipitatedwithinPZTgrainsexperiencetetragonaltomonoclinicphasetransition，companiedbyvolumeexpansionThisvolumeexpansionputstensionstressonPZTgrain—boundariesThus，gra

7、inboundariesaremechanicallystrengthenedandbothfracturestrengthandfracturetoughnessofthePZT／ZrOzcompositesaregreatlyimprovedDouble—precursormethodisusedforpreparingPbl《Srx(Mnl／3Sb2，3)aZrbTic03andPblxBax(Mnl／3Sb2／3)＆zrbTic

8、03piezoelectricceramics，whichA。siteprecursorisgetbycoprecipitationandBsiteprecursorbysolidstatereactionPhaseboundarymovestichZrnearwhichpiezoelectricanddielectricpropertiesareimprovedwithSr2(orBa2)substitutingratePiezoel

9、ectricpropertiesofceramicspreparedbyprecursormethodarepriortoconventionallymixedoxidescalcinationsTheoptimizedresultsof￡=1791，tan6=O0035，d33=45410。12C“hi一，kp=061areobtainedItisshownthatcompositionofceramicpreparedbyprecu

10、rsormethodismorehomogeneousthanconventionallyprocessing，thuspiezoelectricanddielectricpropertiesareimprovedKeywords：precursormethodreactionmechanismleadzirconatetitanatepartiallychemicalmethodleadmanganeseantimonyleadzir