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1、ReviewJournalofAdvancedDielectricsVol.2,No.2(2012)1241010(24pages)©WorldScienti¯cPublishingCompanyDOI:10.1142/S2010135X1241010XDIELECTRICRELAXATIONINRELAXORFERROELECTRICS,‡,†,§ALEXEIA.BOKOV*andZUO-GUANGYE**DepartmentofChemistryand4DLABSSimonFraserUniversity,8888UniversityDriveBurnaby,Brit
2、ishColumbia,V5A1S6,Canada†ElectronicMaterialsResearchLab.KeyLab.oftheMinistryofEducationandInternationalCenterforDielectricResearchXi'anJiaotongUniversity,Xi'an710049,P.R.China‡abokov@sfu.ca§zye@sfu.caReceived6May2012Published15June2012Inthisreviewthedielectricpropertiesofrelaxorferroelec
3、tricsarediscussedandcomparedwiththepropertiesofnormaldielectricsandferroelectrics.Wetrytodrawageneralpictureofdielectricrelaxationstartingfromatextbookreviewoftheunderlyingconceptsandpayattentiontocommonbehaviorofrelaxorsratherthantothefeaturesobservedinspeci¯cmaterials.Wehopethatthisgene
4、ralapproachisbene¯cialtothosephysicists,chemists,materialscientistsanddeviceengineerswhodealwithrelaxors.Basedontheanalysisofdielectricproperties,acomprehensiveby221.10.50.230on02/06/13.Forpersonaluseonly.de¯nitionofrelaxorsisproposed:relaxorsarede¯nedasferroelectricsinwhichthemaximuminth
5、etemperaturedependenceofstaticsusceptibilityoccurswithinthetemperaturerangeofJ.Adv.Dielect.2012.02.Downloadedfromwww.worldscientific.comdielectricrelaxation,butdoesnotcoincidewiththetemperatureofsingularityofrelaxationtimeorsoftmodefrequency.Keywords:Relaxorferroelectrics;dielectricspectr
6、oscopy;stretchedexponentialrelaxation;VogelFulcherlaw.1.IntroductionthetemperaturedependencesofrelativedielectricpermittivityinthecanonicalrelaxorferroelectricRelaxationmeansasystem'smonotonousapproachtotheequilibriumstateaftersomeexcitation.InPb(Mg1=3Nb2=3ÞO3(PMN),thesolidsolutionofthec
7、aseofdielectricrelaxationoneconsidersthePMNandPbTiO3,andtheclassicalnormalferro-responseofpolarizationtoanexternal(usuallyelectricBaTiO3forcomparison.Thedi®erenceissmall)electric¯eld.Relaxorferroelectrics,orevidentandwillbediscussedindetailinthefol-relaxors,areaclas
