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1964200435*∗250100*603770412003-11-061975TiO2Bi-Ti-OTiO2(Bi4Ti3O12Bi12TiO20)TiO2XB1A1001-9731200411972FujishimaHonda[1]TiO2H21976,FrankTiO2TiO2TiO2ZnOCdSWO3SnO2LaFeO3LaCoO3TiO2Bi-Ti-O2TiO2TiO23.2eV387.5nm5%TiO228%[2]TiO2[3]TiO22.1TiO2TiO2-TiO2TiO2Choi[4]21TiO2Fe3+Mo5+Rn2+Os2+Re2+V5+Rh2+TiO2,Co3+Al3+Li+Mg2+Zn2+Ga3+Zr4+Nb5+Sn4+Sb5+Ta5+Sakata[5]Cu2+TiO2Iwasaki[6]Co2+TiO2[7]MoTiO2MoTiO2Mo0.5%~1.5%Scalafani[8]Fe3+TiO2Fe3+TiO2Fe3+TiO21965Fe3+TiO2-[9]TiO22.2CdS-TiO2SnO2-TiO2WO3-TiO2ZrO2-TiO2V2O5-TiO2Kang[10]CdS-TiO24-TiO2[11]Sn4+TiO2TiO2[12]TiO2SiO2Fe3+,Fe/Ti/Si,TiO2[13]Al2O3/TiO2TiO2Al2O3/TiO2Al2O3TiO2=3972.3TiO2TiO2TiO2TiO2[14]TiO2TiO2TiO24[15]TiO2TiO2TiO232.4TiO2Pasin[16]Chatterjee[17]8-TiO25h68%73%97%TiO233.1ZnOWOFe2O3SnO2Bi2O3WangCun[18]ZnO/SnO2ZnO/SnO22:1ZnO/SnO2ZnO/SnO23.2II-IVZnSCdSCdSeTiO2SnO2ZnO3.3ABO3ABO3AB[19~21]LaFeO3LaCoO3LaFe1-xCuxO3SrFeO3-λ4Bi-Ti-O4.1Bi4Ti3O12Bi4Ti3O12BiTiO2[22]BiTiO2Bi1%()TiO21%()TiO21%()Bi5%()196620043511BiFig1Thedependenceofthephotocatalyticdecompositi-onofmethylorangewiththeBidopingconcen-trationunderUVirradiatedBi10%()TiO2XRDTiO2Bi4Ti3O12Bi4Ti3O1222XRDaTiO2b10at.%BiTiO2Fig2XRDpatternsof(a)undopedTiO2and(b)10at.%Bi-doped.Bi4Ti3O123cBi2Ti3O102-(Bi2O2)2+[23](Bi2O2)2+[24]Bi2Ti3O102-(Bi2O2)2+[25]BiTiO2(Bi2O2)2+BiTiO2Bi4Ti3O124.2Bi12TiO20[26~28]Bi12MO20-XMPbNiAlTiFeI237BiBi-OMO4[29]Bi12TiO20Bi12PbO19Bi12NiO19Bi24AlO39Bi36Fe2O57P25(TiO2)~2.14~2.59eV480~580nmTiO23.2eV387.5nm3[26~28]3~Fig3UV-VsdiffusereflectancespectrumsofpreparedsillenitepowderBi12TiO20Bi12TiO205g/lP-25TiO2(4)Bi12TiO20O2O2-[30]GenrischerHeller[31]1967O2O2Bi2O3,[32]Tsubo[33]Bi12TiO20Bi-OO24Fig4.ThedecreaseofmethylorangeasafunctionofUVirradiationtime(B)Bi12TiO20calcinedat600for5min.(C)DegussaP-25.Methylorange,20mg/lBa2+Bi12TiO20Ba2+0.5%()Bi12TiO20Ba2+Ti4+O2580TiO2(Rutile)(Anatase)TiO2TiO2[34]5.1TiO2TiO2TiO2[35]5.2TiO2[35]5.3TiO250TiO2TiO2TiO2[35,36]5.4TiO2[35,36]110TiO2160TiO2TiO2TiO25.530~40nmTiO21968200435TiO2TiO21000TTiO230~50nm[37]6TiO2TiO2Bi4Ti3O12Bi12TiO20Bi-Ti-OTiO2[1]FujishimaA,Honda,K.[J].Nature,1972,238(358):37-38.[2]MichaTomkiewicz.[J].CatalysisToday,2000,58:151-159.[3]HoffmanMN,MartinST.[J].ChemicalReviews.1995,95:69-76.[4]ChoiW,TerminA,HoffmannMR.[J].JPhysChem,1994,98(5):13669-13679.[5]SakataY,YamamotoT,OkazakiT,etal.[J].ChemLett,1998(12):1253-1261.[6]IwasakiM,HaraM,KawadaH,et.al.[J].JColloidInterfaceSci,2000;224(1):202-206.[7],,,.[J].()2001,40(2):125-127.[8]SclafaniA.[J].JPhotochem,Photobiol,1991,56:113-116.[9],,.[J].,2000,28(2):15-20,25.[10]KangMG,HenHE,KimKJ.[J].JPhotochemPhotobiolA:Chem,1999,125(1/2/3):119-125.[11],,,.[J].2002,8(1):23-26.[12],,,.[J]2000,58(5):548-553.[13],,.[J].,2001,19(2):88-95.[14].[J].,2000,13(3):28-32.[15],,.[J].,2001,2(4):30-33.[16]PasinB,RickaboughJ,Hazard.Ind.[J].Wastes,1991,23:359-367.[17]ChatterjeeD,MahataA.[J].CatalCommun,2001,2(1):1-3.[18]CunWang,JincaiZhao,XinmingWang.[J].AppliedCatalysis,B:Environmental2002,39:269-279.[19],.[J].,1999,16(3):97-99.[20],.[J].,1999,20(6):623-627.[21],.[J].,2000,12(5):514-516.[22]XuXiaohong,WangM,HouY,etal.[J].JournalofMaterialScienceLetters,2002,21:1655-1656.[23]CumminsSE,CrossLE.[J].ApplPhysLett,1967,10:14-20.[24]PazCA,DeArauzo,CuchiaroJD,etal.[J].Nature(London),1995,374:627-629.[25]ParkBH,KangsBS,BuD,etal.[J].ibid,1999401:682-687.[26]FengYaoW,WangHong,HongXuX.[J].JournalofMolecularCatalysisA:Chemical2003,202:305-311.[27]FengYaoW,WangHong,HongXuX.[J].AppliedCatalysisA:General,2003,243:185-190.[28]FengYaoW,WangHong,TaoZhouJ.[J].ChemicalPhysicsLetters,2003,377:501-506.[29]MatjazV,DaniloS.[J].AMCeramSoc,2001,84:2900-2912.[30]LinsebiglerA,GLu,YatesJT,[J].ChemRev,1995,95:735-739.[31]GerischerH,HellerA,[J].ElectrochemJ.Soc,1992,139:113-117.[32]WengL,DelmonB.[J].ApplCatalA.,1992,81:141-147.[33]OtsuboT,HiuraH,HorikawaY,etal.[J].JCatal,1975,36:240-244.[34].[J]..2000,10:3-4.[35],,.[J].,2000,41(11):567-570.[36].[J].,2000,28(11):3-5.[37].,.[J].,1998,(6):26-30.La0.67Mg0.33Ni2.5Co0.51973InternationalJournalofHydrogenEnergy,2003,28:113-117.[8]PanHongge,LiuYongfeng,GaoMingxia,etal.[J].JournalofAlloysandCompounds,2003,351:228-234.[9]KadirK.,SakaiT.,UeharaI.etal.[J].JournalofAlloysandCompounds,1999,287:264-270.[10]KadirK.,SakaiT.,Uehara.I.etal.[J].JournalofAlloysandCompounds,2000,302:112-117.[11]KadirK.,SakaiT.,UeharaI,etal.[J].JournalofAlloysandCompounds,1997,257:115-121.[12]LiaoB.,LeiYQ,LuGL,etal.[J].JournalofAlloysandCompounds,2003,356-357:746-749.Astudyonthesinteringsynthesisandthemicro-structuralandelectrochemicalpropertiesofLa0.67Mg0.33Ni2.5Co0.5hydrogenstoragealloyXINGChang-ce1,2,LUOYong-chun1,YANRu-xu,WANGDa-hui,KANGLong1(1.KeyLaboratoryofNewNonferrousMetalMaterials,LanZhouUniversityofSciandTech,Lanzhou730050,China;2.InstituteofMaterialsEngineeringandchemicalEngineering,LiaoningInstituteofTechnology,Jinzhouliaoning121001,China)AbstractInthispaper,La0.67Mg0.33Ni2.5Co0.5alloywassynthesizedbysinteringwithtemperaturestepwiseway.Thesinteringconditionsandthemicro-structuralandelectrochemicalpropertiesofthealloyhasbeenstudiedsystematically.FromtheXRDandSEManal