Do we need ether of polar nanregions.pdf

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1、JournalofAdvancedDielectricsVol.2,No.2(2012)1241006(6pages)©WorldScienti¯cPublishingCompanyDOI:10.1142/S2010135X12410068DOWENEEDTHEETHEROFPOLARNANOREGIONS?J.HLINKAInstituteofPhysics,AcademyofSciencesoftheCzechRepublicNaSlovance2,18221Prague8,CzechRepublichlinka@fzu.czReceived17F

2、ebruary2012Published15June2012Thispaperdealswithpossibleexperimentalsignaturesoftheso-calledpolarnanoregionsinlead-basedperovskiterelaxors.Itoutlinesbothtraditionalandalternativeapproachestothesesignatures.Itisarguedthattheconceptofpolarnanoregionsisusefulbutlargelyspeculative.P

3、olarnanoregionsarecomparedwithferroelectricnanodomains.Qualitativeexplanationoftheprincipalrelaxor"propertiesofPMNarediscussedinbothframeworks.Itisarguedthatpolarizationasavectormaynotbewellde¯nedatanynanometricregioninPMNCrystal.Keywords:Relaxors;ferroelectrics;polarnanoregion

4、s;di®usescattering.1.IntroductionabouttheveryexistenceofPNRsasstaticentities.3by123.138.79.200on10/11/12.Forpersonaluseonly.Therefore,thenotionofPNRscertainlydeservestoTheusefulmacroscopicpropertiesoflead-basedbeusedwithcaution.4J.Adv.Dielect.2012.02.Downloadedfromwww.worldscien

5、tific.comperovskiterelaxorsarenowadaysexploitedinmanyHavingsaidthis,weshouldperhapsindicatehowdevices.Atthesametime,thenanoscalestructuraltherelaxorcanbede¯nedinanalternativeway,arrangementinthesematerialsisstillchallengingwithoutrecallingPNRs.Forthepurposeofthisourexperimentala

6、ndtheoreticaltechniques.Con-paper,wemaysimplythinkaboutPbMg1=3Nb2=3O3sequently,theverybasicandfamousconceptslike(PMN)andprofoundlyanalogousmaterials,sincepolarnanoregions(PNRs)ormorphotropicphasethereisoverallconsensusthatPMNisamodelboundary(MPB)arevividlydebatedinthescien-relax

7、orsystem.Suchananalogyshouldclearlyti¯ccommunityandtheirprecisemeaningisstillinvolveoneormorewell-knowntypical"proper-questioned.Forsomeauthors,thetheoreticalpic-ties,andideally,thephysicalprinciplebehindthetureofPNRemergingfromanonpolarmatrixissimilarityshouldbesameaswell.Apos

8、siblelistofquiteobviousanditisconsideredasthees