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1、JournalofAlloysandCompounds468(2009)295298PreparationandphotonicbandgappropertiesofleadlanthanumtitanateinverseopalphotoniccrystalsZhengwenYang,XueguangHuang,GangYang,QinXie,BoLi,JiZhou∗,LongtuLiStateKeyLabofNewCeramicsandFineProcessing,DepartmentofMaterialsSciencean
2、dEngineering,TsinghuaUniversity,Beijing100084,PRChinaReceived3November2007;receivedinrevisedform14December2007;accepted20December2007Availableonline3January2008AbstractTheleadlanthanumtitanate(PLT)inverseopalphotoniccrystalswerepreparedbytheself-assemblytechniqueinco
3、mbinationwithasolgelmethod.Inthepreparationprocess,PLTprecursorswerefilledintotheintersticesoftheopaltemplateassembledbymonodispersivepolystyrenemicrospheres.Thepolystyrenetemplatewasthenremovedbycalcinationat650◦Cfor5h,meanwhile,aperovskitePLTinverseopalphotoniccryst
4、alwasformed.AnopticalmicrographshowsthatthePLTinverseopalsreflectgreenbluelightstrongly.Moreover,aphotonicbandgapwasobservedbyreflectivespectraofPLTsample.©2007ElsevierB.V.Allrightsreserved.Keywords:Inverseopalphotoniccrystals;Ferroelectircs;Leadlanthanumtitanate;Solge
5、lpreparation1.Introductionopticeffectsandahighrefractiveindexinvisiblewavelength[19,20].Asweknow,however,therehasbeennoreportabouttheRecently,muchattentionhasbeenfocusedonthethree-PLTinverseopalsexcepttheinverseopalscomprisedofdifferentdimensionalphotoniccrystalssinc
6、etheconceptwasproposedferroelectricssuchasBaTiO3orPb0.91La0.09(Zr0.65,Ti0.35)O3byYablonovitchandJohn[1,2]forapplicationpotentialinanreportedintheliteratures[15,18].Additionally,comparedtotheareaofphotonics,includingnear-zerothresholdlasers,sensors,PLZTceramics,thepre
7、parationofPLTsolgeliseasierduetowaveguide,photoniccrystalfibers,etc.[36].Inordertomeetitssimplestructure.mostoftheseapplications,variousstructuralphotoniccrystalsAwidevarietyofmethodshavebeendevelopedforthesuchasopal,inverseopal,woodpile,diamondstructure,etc.preparati
8、onofthree-dimensionalphotoniccrystals,includinghavebeenfabricated[710].Theinverseopalsarecomprisedofcolloidalself-assemblymethod,th
