巨介电常数复相陶瓷的结构与性能

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1、浙江大学硕士学位论文AbstractDielecmcpennittiV埘indicatesthepolarizationsⅡengmofthematerialsllllderelectricalfieldandmaterialswitlllli曲erdielectricconstantarecapableofstoringmorecha唱es．Giamdielectdcconstantmaterialscouldminianlrethedevices，a11dt11ereforecouldimp

2、rovemeinte口ationofcircuits．neyareusuallyusedtofabricatec印acitors，dynaI】AicorstaticmemoriesaI】dsoon．Inthepresentwork，thecompositematerials、vitllaconductingphasedispersedinmeinsulatingphasewerepreparedandcharacterizedinordertoexplorenewgiantdielectricc

3、onstantcompositematerials．NoVelhi曲dielectricconstantcompositematerialswerepreparedbyincorporat啦medispersedCuOsemiconductingpaniclesintoSrTi03matrix．111mesinteringprocess，partofcu0衄1sfbmedintoCu20phase，whichwaSofahi曲erconductivi何Thelocalatmospherespla

4、yedanimportantmleintllisprogress．Therefore，CuO—Cu20transfo加ationwouldtakeplacemoreeasilyinlowCuOcontentcompositesthanint11ehi曲CuOcontemonesevent11eyweresintered1111dermes锄econditions．Adielectriccons伽1tintheorderof104wasobtainedintllecompositewim40m01

5、％Cu0．Micms仃ucturesofthecompositematerialsdominatedtheirdielectricpmperties．InO．6SrTi03，o．4CuOcomposites，theseparatedconductingpaniclesappmachtoeachotller，which1eadtoⅡ1etllinnerofthesmallcapacitorsbetweentwosemi—conductingpalticles，andhencethehigheref

6、I色ctiVedielectricconstantofmecomposites．Hetero·stmcturesfb瑚edintheinterfacesofCuO／Cu20andSfn03duringthesinteringprogress，whichhinderedtllemovementsofoxygenvacallciesneartheimerfaces，leadingtoadielectricrela)(ationathightemperatllres．Fourdistinctdiele

7、c埘crela)【ationswereobservedinBaTio8Sno203／CuOcompositecer枷cs．Oneofthem印pearedinthevicinityofCurietempe咖eattributedtomerelaxorfcafuresofBano8S110203．TherelaXationinmeregionalitnehigherthallC证etemperatIlrewascausedbyt11eime血ciale脏ct．WeobseⅣeda浙江大学硕士学位论

8、文⑧veryexceptionalrela)(ationint11etemperafureraulgeof1500C一2000C，onlyinO．6BaTio8Sno203／0．4CuOand0．4BaTio8S110203／o．6CuOs锄ples，which111ightbeduetotherelativemoreCu20phaseinthetwosamples．Therelaxationnear3000CshollldbeduetotheoxygenVacaIlciesasmeoneapp