4-synthesis and magnetic properties of Mn-Zn ferrite nanoparticles

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1、ARTICLEINPRESSJournalofMagnetismandMagneticMaterials](]]]])]]]–]]]www.elsevier.com/locate/jmmmSynthesisandmagneticpropertiesofMn–ZnferritenanoparticlesYiminXuan,QiangLi,GangYangSchoolofPowerEngineering,NanjingUniversityofScienceandTechnology,Nanjing21009

2、4,ChinaReceived14September2006;receivedinrevisedform11November2006AbstractMn–Znferritenanoparticles(Mn1xZnxFe2O4)aresynthesizedbyahydrothermalprecipitationapproachusingmetalsulfatesolutionandaqueousammonia.TheanalysismethodsofXRPD,TEM,TGA,andVSMareusedto

3、characterizethemagneticnanoparticles.Throughthecharacterizationoftheprecipitatednanoparticles,theeffectsofthereactingcomponentproportionsandpreparationtechniquesontheCurietemperature,themagnetization,andthesizedistributionofMn–Znferritenanoparticlesaredis

4、cussed.Furthermore,theMn–Znferritenanoparticlesareusedtoprepareferrofluid.VariationofthemagneticpropertiesoftheferritenanoparticleswiththecompositioncontentxofZnandthemagneticmomentofthenanoparticlesarediscussed.r2006ElsevierB.V.Allrightsreserved.Keywords:

5、Hydrothermalprecipitation;Mn–Znferritenanoparticles;Magneticproperties1.IntroductionOnemayfindsomepublicationsonpreparationtechni-quesandmagneticpropertiesoftemperaturesensitiveManganesezincferritesaretechnologicallyimportantferritematerials[2,3,8].Applica

6、tionpotentialsofthematerialsbecauseoftheirhighmagneticpermeabilityandferrofluidsmadefromthetemperaturesensitiveferritelowcorelosses.Theseferritenanoparticleshavebeennanoparticlescontinuallystimulateinvestigationeffortsinwidelyusedinelectronicapplicationssu

7、chastransformers,preparation,characterization,andapplicationattemptofchokecoils,noisefilters,andrecordingheads[1].Recently,theseferritenanoparticles.InvestigationhasrevealedthattheyareoftenusedtopreparetemperaturesensitivetheCurietemperatureandmagnetizatio

8、nofMn–Znferriteferrofluidsforapplicationsinheattransferenhancementnanoparticlesaredependentuponcompositionfractionsandenergyconversiondevices[2,3].Ferriteswerepre-andparticlesize.Forthepurposeofcontrollingflowandvious