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1、J.Mater.Sci.Technol.,Vol.23No.5,2007655SynthesisofNano-sizedBariumTitanatePowderbySolid-stateReactionbetweenBariumCarbonateandTitaniaU.Manzoor1)yandD.K.Kim2)1)DepartmentofPhysics,COMSATSInstituteofInformationTechnology,Islamabad,Pakistan2)DepartmentofMaterialsScienceandEngineering,KoreaAdvancedI
2、nstituteofScienceandTechnology(KAIST),Daejeon,Korea[ManuscriptreceivedJune14,2006,inrevisedformApril10,2007]SizecontrolofBaTiO3insolid-statereactionbetweenBaCO3andTiO2wasdemonstratedbyvaryingthesizeofTiO2andmillingconditionsofBaCO3.ThesmallerTiO2particleshadhighersurfacearea,resultinginfasterini
3、tialreaction.ThemechanicallymilledBaCO3particlesacceleratedthediffusionprocessanddecreasedthecalcinationstemperature.Itcanbededucedfromtheresultsthatthesizecontrolispossibleandnano-sizedBaTiO3particleswithabout60nmcanbesynthesizedbyusingtheconventionalsolid-statereactionbetweenBaCO3andTiO2.KEYWOR
4、DS:Bariumtitanate;Mechanicalmilling;Solid-statereaction;Nanoparticles1.Introductionver,thisroomtemperaturesynthesisstartingfromtheoxideshastoovercometheproblemofhy-Oxidenanoparticlesandnanostructuresaregooddration/carbonation,bariumoxidebyairandcandidateforavarietyofapplications,suchashighmoistu
5、re[11].capacitancecapacitors,thermistors,gassensorsandInthisstudy,sizecontrolandsynthesisofnano-positivetemperaturecoefficientresistors(PTCR)[1;2].sizedbariumtitanatewasdemonstratedbyusingme-Alkalineearthmetaltitanatesarebecomingincreas-chanicallyactivatedBaCO3andnano-sizedTiO2.inglyimportantinthe
6、ceramicandelectronicindus-try.Nano-sizedbariumtitanatehasbeenattract-2.Experimentalinginterestbecauseoftheirapplicationintechnicalandfundamentalresearch.ItisthereforeimportantBariumtitanatewassynthesizedfromcommer-tosynthesizenano-sizedBaTiO3powderwithnar-ciallyavailableBaCO3(99%,purity)andTiO2r
7、owparticlesizedistribution.Ingeneral,BaTiO3(KA100,HankookTitaniumIndustryCo.Ltd.,Ko-nanoparticleshavebeensynthesizedbywetchemicalrea,d50=200nm).Forcomparison,smallerTiO2processe[3;4].However,highcostanddifficultyinpro-(P25,Deg
