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1、ReviewJournalofAdvancedDielectricsVol.2,No.2(2012)1241010(24pages)©WorldScienti¯cPublishingCompanyDOI:10.1142/S2010135X1241010XDIELECTRICRELAXATIONINRELAXORFERROELECTRICS,‡,†,§ALEXEIA.BOKOV*andZUO-GUANGYE**DepartmentofChemistryand4DLABSSimonFraserUniversity,8888Univers
2、ityDriveBurnaby,BritishColumbia,V5A1S6,Canada†ElectronicMaterialsResearchLab.KeyLab.oftheMinistryofEducationandInternationalCenterforDielectricResearchXi'anJiaotongUniversity,Xi'an710049,P.R.China‡abokov@sfu.ca§zye@sfu.caReceived6May2012Published15June2012Inthisreviewt
3、hedielectricpropertiesofrelaxorferroelectricsarediscussedandcomparedwiththepropertiesofnormaldielectricsandferroelectrics.Wetrytodrawageneralpictureofdielectricrelaxationstartingfromatextbookreviewoftheunderlyingconceptsandpayattentiontocommonbehaviorofrelaxorsratherth
4、antothefeaturesobservedinspeci¯cmaterials.Wehopethatthisgeneralapproachisbene¯cialtothosephysicists,chemists,materialscientistsanddeviceengineerswhodealwithrelaxors.Basedontheanalysisofdielectricproperties,acomprehensiveby123.138.79.200on10/11/12.Forpersonaluseonly.de¯
5、nitionofrelaxorsisproposed:relaxorsarede¯nedasferroelectricsinwhichthemaximuminthetemperaturedependenceofstaticsusceptibilityoccurswithinthetemperaturerangeofJ.Adv.Dielect.2012.02.Downloadedfromwww.worldscientific.comdielectricrelaxation,butdoesnotcoincidewiththetemper
6、atureofsingularityofrelaxationtimeorsoftmodefrequency.Keywords:Relaxorferroelectrics;dielectricspectroscopy;stretchedexponentialrelaxation;VogelFulcherlaw.1.IntroductionthetemperaturedependencesofrelativedielectricpermittivityinthecanonicalrelaxorferroelectricRelaxati
7、onmeansasystem'smonotonousapproachtotheequilibriumstateaftersomeexcitation.InPb(Mg1=3Nb2=3ÞO3(PMN),thesolidsolutionofthecaseofdielectricrelaxationoneconsidersthePMNandPbTiO3,andtheclassicalnormalferro-responseofpolarizationtoanexternal(usuallyelectricBaTiO3forcompariso
8、n.Thedi®erenceissmall)electric¯eld.Relaxorferroelectrics,orevidentandwillbediscussedindetailinthefol-relaxors,areacla
