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1、NanoStructuredMaterials,Vol.12,pp.143-146,1999ElsevierScienceLtdPergamon01999ActaMetallurgicaInc.PrmtedintheUSA.Allrightsreserved09659773/99/$-seefrontmatterPI1SO9659773(99)00084-7SYNTHESISANDCHARACTERIZATIONOFNANOCRYSTALLINEZINCFERRITEJ.S.Jiang*,X.L.Yang*,L.Gao+,J.K.Guo+,andJ.Z.Jian$*
2、DepartmentofChemistryandPhysics,EastChinaNormalUniversity,Shanghai200062,P.R.China+TheStateKeyLabonHighPerformanceCeramicsandSuperfineMicrostructure,ShanghaiInstituteofCeramics,ChineseAcademyofSciences,Shanghai200050,P.R.China#DepartmentofPhysics,Building307,TechnicalUniversityofDenmar
3、k,DK-2800Lyngby,DenmarkAbstract--Nanocrystallinezincferritepowderswithapartiallyinvertedspine1structureweresynthesizedbyhigh-energyballmillinginaclosedcontaineratambienttemperaturefiomamixtureofa-Fez03andZnOcrystallinepowdersinequimolarratio.Fromlow-temperatureandin-fieldMtisbauermeasu
4、rementsitisrevealedthatZnFez04particlespreparedareinsuperparamagneticstateatambienttemperature.Adoubletwithanaveragequadrupolesplittingof0.8mm/sisobservedfortheas-milledsampleat295K,whichismuchlargerthanthatforbulkZnFez04preparedbytraditionalceramicmethodandthatforultrafineZnFez04parti
5、clespreparedbytheco-precipitationmethodThisindicateslargerstructuraldefectsinthenanometer-sizedZnFez04particlespreparedbyhigh-energyballmilling.01999ActaMetallurgicaInc.INTRODUCTIONHigh-energyballmilling(mechanicalalloyingormechanicalgrinding)hasbeenwidelyusedforthesynthesisofmaterials
6、,whicharefarfromequilibrium,suchasnanocrystalline,amorphous,andsupersaturatedalloysandceramics(l-4).Lefelshteletal.(5)andKosmacandCourtney(6)havereportedontheattemptedsynthesisofZnFez04andNiFe204bymillingofCL-Fe203withZnOandNiOpowders,respectively.Theformationofsinglespine1phaseswasnot
7、achieved.Byvirtueofmagneticproperties,zincferrite,ZnFez04,anditssolidsolutionswithotherferritesarewidelyusedintheelectronicindustry.ZnFez04hasanormalspine1structurewithzincionsexclusivelyoccupiedinthetetrahedralsites.Severaltechniques,e.g.,co-precipitation(‘l),sol-gel(X),andtwinrolle
