PSN基弛豫型鐵電陶瓷介電弛豫性能研究.pdf

1、北京工業(yè)大學碩士學位論文PSN基弛豫型鐵電陶瓷介電弛豫性能研究姓名：陳川申請學位級別：碩士專業(yè)：材料物理與化學指導教師：朱滿康20080401ABSTRACTABSTRACTRelaxorferroelectricisailimportantadvancedfunctionalmaterialduetoitswideapplicationinmodemelectricfieldGreatprogresshasbeenobtainedin

2、therecentyearsandnewrelaxorferroelectricsweresynthesizedHoweverthemechanismofrelaxorisstillindisputationIntiffspaperPb(ScvzNbl／z)03(PSN)relaxorferroelectricandPb(gcl／2Nbl／2)03一PbTi03(PSNPT)ceramicswerepreparedbyconventio

3、naltwostepmethodandthermaltreatmentwasadoptedtotheseceramicssamplesMicrostructureswerestudiedbyX—raydiffractionandRaman—scatteringspectroscopyetcDielectricpropertiesandferroelectricpropertiesweremeasuredbydigitalelectron

4、bridgeandferroelectricparametermeteretcTheeffectofthermaltreatmentonmicro—structure，dielectricpropertiesandferroelectricpropertiesinPSNrelaxorWasfirstlystudiedItwasfoundthattheas—sinteredsamplehasthelowestBsiteorderdegre

5、eaccordingtotheanalysisofXRDandRamanresultThedielectricpropertiesmeasuredat100Hzwasobtained：￡產(chǎn)33x104，Tn=970C，么％=50C；withtheincreasingtimeofthermaltreatment，theBsiteorderdegreeincreasedandthevarietyoccurred：thevalueof8rde

6、creased，andbothofTmandzSTmdroppedItWasfoundthatthethermaldiffusionandtherearrangementofBsitecationsintheprocessofannealingledtothevarietyofenergyandthechangesinthedielectricandferroelectricbehaviorsToexplaintheinternaldr

7、ivingforceofthechanges，thedielectricspectrawerefittedbydualpolarizationmechanismsmodelMoreovertherelaxorpropertiesof(1一x)PSN—xPTceramicswerestudiedinthisthesisItWasfoundthat，whentheamountofPbTi03increased，therelativecont