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1、第27卷第3期无机材料学报Vol.27No.32012年3月JournalofInorganicMaterialsMar.,2012文章编号:1000-324X(2012)03-0281-04DOI:10.3724/SP.J.1077.2012.00281(Ba1-xSrx)La4Ti4O15(x=0.8~0.95)陶瓷的微结构及微波介电性能研究111211刘林,方有维,邓新峰,庄文东,唐斌,张树人(1.电子科技大学电子薄膜与集成器件国家重点实验室,成都610054;2.成都泰格微波技术服份有限公司,成都61
2、1731)摘要:采用固相反应法制备了(Ba1-xSrx)La4Ti4O15(x=0.8~0.95)复合体系微波介质陶瓷,并对其进行物相组成、晶体结构分析以及微波介电性能的研究.研究结果表明,(Ba1-xSrx)La4Ti4O15陶瓷主晶相为SrLa4Ti4O15,并伴随有第二相SrLa8Ti9O15.SEM观察表明,Ba0.2Sr0.8La4Ti4O15陶瓷内部微观结构致密,晶粒尺寸在10~20μm之间,晶界清晰.随着x值逐渐增大,(Ba1-xSrx)La4Ti4O15陶瓷中晶粒形态发生变化,气孔增多.在x=
3、0.8时,(Ba1-xSrx)La4Ti4O15陶瓷具有−62+优良的微波介电性能,即εr=40.86,Q×f≈62806GHz,τf=−20×10/℃.随着Ba的含量逐渐增加,该陶瓷的介电常2+2+数εr单调上升,品质因子Q×f值增加,说明适量的Ba替代Sr能改善陶瓷的微波介电性能.关键词:微波介质陶瓷;类钙钛矿结构;微波介电性能;SrLa4Ti4O15中图分类号:TM534文献标识码: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
