非线性可调锡钛酸钡钙陶瓷的介电性能和铁电相变

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1、浙江大学硕士学位论文⑧AbstractRecently，fieldtunabledielec砸cshavebeene越ensivelystudiedduetotlleirimponantapplic撕onsinthefieldtunablede埘cessuchaSvo】tage-controJledoscillators，tunablefiltersarIdphaseshiRers．In小eseapplications，bothhi曲tun曲ility(=[￡(o){但)】／￡(O))andlowdielecmc10ssarerequired耵lecu盯entlymoststu出edmat

2、erjaIsareperovskitesrTj03(sT)，(Ba，Sr)Ti03(BST)andBa(z‘Ti)03毋zT)hordertoexplorepotentialcalldidatesforfieldtLmabledielecmcmaterials，thepresentworkisfocusedonthemicrostructIlresandmenonlineardielec砸cpropertiesofA—andB-sitesubsdtutedb撕响“锄RateceramicsInordertoob恤nhighnon—lineardielectric札Inabilitynear

3、roomtemperature，tlleBaTi03baSedsolutionwe『emod讯ed嘶thCa2+a11dSn4+todecreasedielectric10ssandshmtheCurietemperature．T_

4、lecubicperoVskitestructureisobtainedfor①a1．xcax)(Til一ysny)03(X=O．05，O．1y=O05，O10，0．15and0．20)solidsol曲0nwimincreaSingsncontent，mepeakofdielec砸cconstantaIlddielect—cIossmovetotheIowe

5、rtemperature，TheSncontenta11dT0fItalinearrelationshipFor(Ba095Ca005)(Til．ySny)03atld(Ba095cao．05)(Til—ysny)03，mem商mumdielectricconstant(￡m)atTmincreases撕thmcre撕ngSncontentfirstlyatldthendecreaSesThesubs石t11石onofCadoesnotchallgemeT0of(Bal—xc的(Til．ysny)03distinctly．Asmallqu柚t时ofcacallincrease曲ediele

6、嘶cconstanta11ddecreasetlledielec仃icIossat山emomtemperature．c“snco—substi嘶onshifts廿1eTmof(Bal．。c瓠)(Til．ySny)03ceranlicstowardsmeroomtemperature(Bao95Ca005)(Til．ySny)03cer哪icsexhibitexcellentdielect“ctunabmtyundertheDCbiaS．Wheny=O15，theten曲ilityat10kHzisashighas35．4％uIlderarelatiVelowelectric-field(2

7、OkV／cm)．Itkeeps241％attheroom把mperatureandaboVe20％inabmaderrangaroundt11eroomtemperatureWhenthefbquenciesare1OOkHzandlMH弓thetenabilitykeepsbetween40一50％att11eroomte唧eratureneTmof毋al—xCax)(Til．，sny)03towardst}lemomtemper咖re、vitllincre髂ingCacontent．AccordingtotheDevonshiret11eoryandtheexperimentdata，

8、higher一1一浙江大学硕士学位论文⑧dieIec埘cmbabili锣of①a09ca01)(Til．ySny)03(y=o．05，o．10，o．15和o．20)cer枷cs、villbeobtainedatroomtemperature．witllincreasingSncontent，t11e(Bal．。c戤)(Til．ySny)03ceramicsshow山eenhancedDPT(difhlsephasetr肌