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1、第27卷第3期無機(jī)材料學(xué)報(bào)Vol.27No.32012年3月JournalofInorganicMaterialsMar.,2012文章編號:1000-324X(2012)03-0281-04DOI:10.3724/SP.J.1077.2012.00281(Ba1-xSrx)La4Ti4O15(x=0.8~0.95)陶瓷的微結(jié)構(gòu)及微波介電性能研究111211劉林,方有維,鄧新峰,莊文東,唐斌,張樹人(1.電子科技大學(xué)電子薄膜與集成器件國家重點(diǎn)實(shí)驗(yàn)室,成都610054;2.成都泰格微波技術(shù)服份有限公司,成都61
2、1731)摘要:采用固相反應(yīng)法制備了(Ba1-xSrx)La4Ti4O15(x=0.8~0.95)復(fù)合體系微波介質(zhì)陶瓷,并對其進(jìn)行物相組成、晶體結(jié)構(gòu)分析以及微波介電性能的研究.研究結(jié)果表明,(Ba1-xSrx)La4Ti4O15陶瓷主晶相為SrLa4Ti4O15,并伴隨有第二相SrLa8Ti9O15.SEM觀察表明,Ba0.2Sr0.8La4Ti4O15陶瓷內(nèi)部微觀結(jié)構(gòu)致密,晶粒尺寸在10~20μm之間,晶界清晰.隨著x值逐漸增大,(Ba1-xSrx)La4Ti4O15陶瓷中晶粒形態(tài)發(fā)生變化,氣孔增多.在x=
3、0.8時(shí),(Ba1-xSrx)La4Ti4O15陶瓷具有?62+優(yōu)良的微波介電性能,即εr=40.86,Q×f≈62806GHz,τf=?20×10/℃.隨著Ba的含量逐漸增加,該陶瓷的介電常2+2+數(shù)εr單調(diào)上升,品質(zhì)因子Q×f值增加,說明適量的Ba替代Sr能改善陶瓷的微波介電性能.關(guān)鍵詞:微波介質(zhì)陶瓷;類鈣鈦礦結(jié)構(gòu);微波介電性能;SrLa4Ti4O15中圖分類號:TM534文獻(xiàn)標(biāo)識碼:ACrystalStructuresandMicrowaveDielectricPropertiesof(Ba1-xSrx
4、)La4Ti4O15(x=0.8?0.95)Ceramics111211LIULin,FANGYou-Wei,DENGXin-Feng,ZHUANGWen-Dong,TANGBin,ZHANGShu-Ren(1.StateKeyLaboratoryofElectronicThinFilmsandIntegratedDevices,UniversityofElectronicScienceandTechnologyofchina,Chengdu610054,China;2.ChengduTigerMicrowa
5、veTechnologyCo.,Ltd,Chengdu611731,China)Abstract:The(Ba1-xSrx)La4Ti4O15(x=0.8?0.95)ceramicswerepreparedbythesolid-statereactionmethodandthephasecompositions,crystalstructuresandmicrowavedielectricpropertieswereinvestigated.Theresultsshowthatthe(Ba1-xSrx)La4
6、Ti4O15ceramicshavethemainphaseofSrLa4Ti4O15andthesecondphaseofSrLa8Ti9O15.TheSEMimagesindicatethattheBa0.2Sr0.8La4Ti4O15ceramicwithdensemicrostructureshasgrainsizesofabout10?20μmandclearcrystalboundaries.Thegrainshapesofthe(Ba1-xSrx)La4Ti4O15ceramicschangew
7、ithincreasingxvalues,andtheporesinthesamplesincrease.(Ba1-xSrx)La4Ti4O15ceramicswithx=0.8possessesexcellentmicrowavedi-electricproperties,listedasfollows,thedielectricconstantεr=40.86,thequalityfactorQ×f≈62806GHz,andthe?6temperaturecoefficientofresonantfreq
8、uencyτf=?20×10/℃.Themonotoneincreasesofthedielectricconstantεr2+2+andthequalityfactorQ×foftheceramicswithincreasingBacontents,meanthatthepropersubstitutionofBa2+forSrcanimprovemicrowavedielectricproper
