资源描述：
《155_Iron-nanoparticles-in-X-and-Y-zeolites》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、NanoStracturedMaterials,Vol.12,pp.155-158,1999Else&rScience.LtdPergamon81999ActaMetallurgicaInc.PrintedintheUSA.Allrightsreserved09659113l99l.$-seefrontmatterPIISO%59773(99)00087-ZIRONNANOPARTICLESINXANDYZEOLITESK.LBdrl,H.K.Beyerl,G.Onyestyhk2,BJ.Jiinsson3,L.K.V
2、arga4,S.Pronier5*InstituteofIsotopeandSurfaceChemistry,Budapest,P.O.B.77,H-1525,Hungary2InstituteofChemistry,Budapest,P.O.B.17,H-1525,Hungary3Dept.CondensedMatterPhysics,RoyalInst.Technology,S-10044Stockholm,Sweden4InstituteofSolidStatePhysics,Budapest,P.O.B.49,
3、H-1525,Hungary5LACCO,URACNRS350,UniversitedePoitiers,F-86022Cedex,Poitiers,FranceAbstractStrongreductionofextra-frameworkironionswasattemptedbysodiumazidetoformmetallicironparticleswithdimensionsofafewnanometers.Na-XandNa-Yzeoliteswerepartiallyionexchangedto5wt%
4、Fecontent.Theiron-zeolitesweremixedwithsodiumazide,evacuatedat550Kandheatedto800KinnitrogentoformsodiumvapourbydecomposingNaN3.Thesodiumexertsstrongreduction,apartofironcanbereducedtozerovalentstatetoformparticlesinthenanometersizerange,asinsituMiissbauerspectro
5、scopy,ACsusceptibility,X-raydiffractionandtransmissionelectronmicroscopystudiesrevealed.Simultaneouspartialrecrystallizationofthezeoliteisalsoobserved.01999ActaMetallurgicaInc.INTRODUCTIONZeolitesmayprovideanappropriatehostingmediaforstabilisinghighdispersionmet
6、allicphaseinnanometersizeregion.Forpreparation,asapossibleway,strongreductionofextra-frameworkionscanbesuggested.Themethodwasattemptedforiron,eg.byusingsodiumvapour:at1066K(I),andatlowertemperature(673K)withprolongedperiods(5-48h)(2);apartofironionswasreducedtom
7、etallicstateinbothcases.Toattainthesamereducingeffectthe“localgeneration”ofsodiumvapourcanalsobesuggestedbydecomposingsodiumazideinamixture:2Fe3+-Z+6NaN3+2Fee-Z+6Na++9N2t11where-ZreferstotheXorYzeolitematrix.Itissupposedthatthereductionmayproceedinthecages,atate
8、mperatureexceedingslightlythatnecessarytodecomposeNaN3,andthemetallicparticlesformedareretainedinthecages.Infact,uponthedecompositionofsodiumazideNa43+,Nag5+andNaxocl
