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1、HomeSearchCollectionsJournalsAboutContactusMyIOPscienceHighfrequencydielectricpropertiesofCaTiO3-basedmicrowaveceramicsThisarticlehasbeendownloadedfromIOPscience.Pleasescrolldowntoseethefulltextarticle.2005J.Phys.D:Appl.Phys.38741(http://iopscience.iop.org/0022-3727/38/5/012)View
2、thetableofcontentsforthisissue,orgotothejournalhomepageformoreDownloaddetails:IPAddress:58.60.1.63Thearticlewasdownloadedon19/07/2011at11:26Pleasenotethattermsandconditionsapply.INSTITUTEOFPHYSICSPUBLISHINGJOURNALOFPHYSICSD:APPLIEDPHYSICSJ.Phys.D:Appl.Phys.38(2005)741748doi:10.10
3、88/0022-3727/38/5/012HighfrequencydielectricpropertiesofCaTiO3-basedmicrowaveceramicsAPashkin1,SKamba1,MBerta1,JPetzelt1,GDCCsetedeGyorgyfalva¨2,HZheng2,H.Bagshaw2andIMReaney21InstituteofPhysics,AcademyofSciencesoftheCzechRepublicNaSlovance2,18221Prague8,CzechRepublic2Departmento
4、fEngineeringMaterials,UniversityofSheffield,SheffieldS13JD,UKReceived15September2004,infinalform19November2004Published18February2005Onlineatstacks.iop.org/JPhysD/38/741AbstractWehaveinvestigatedthefar-IR,submillimetreandmicrowave(MW)dielectricresponseofCaTiO3(CT)Sr(Mg1/3Nb2/3)O3(SM
5、N),CTSr(Zn1/3Nb2/3)O3(SZN),CTNdAlO3(NA)andCTLaGaO3(LG)solidsolutionsceramicsseries.Thecontributionofextrinsiclosseshasbeenanalysedbyextrapolationofthefar-IRandterahertzdielectricdatadowntotheMWrangeandcomparisonwithdirectlymeasureddata.Thisprocedurehasalsobeenjustifiedbycomparingt
6、helossesinCTandLGceramicswiththelossesintheircrystallineformspublishedintheliterature.Thecompositionaldependencesofthepermittivityandtemperaturecoefficientontheresonancefrequencyhavebeenanalysedandfittedbyappropriateexpressions.WehavefoundthatinthecaseofCTNAandCTLGceramics,thebestfi
7、tscanbeobtainedusingaClausiusMossottiequationwithlinearlymixedpolarizabilities.Ontheotherhand,forCTSMNandCTSZNceramicstheLichteneckerlogarithmicruleandtheHashinShtrikmanexpressionhavebeenused.Weexplainthisdifferenceasaconsequenceofthedifferentcharacterofshort-rangeorderinginthest
8、udiedceramicsystems.1.Introductionfreque
