编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第PAGE9页共NUMPAGES9页第PAGE\*MERGEFORMAT9页共NUMPAGES\*MERGEFORMAT9页HYPERLINK"http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TX4-4YTD78P-5&_user=10&_coverDate=08%2F01%2F2010&_alid=1407848835&_rdoc=3&_fmt=high&_orig=search&_cdi=5580&_sort=r&_st=4&_docanchor=&_ct=1316&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=3b44b90cba6b4de50b8358a154704d37"AsimplesynthesisofFe3O4powdersandtheirHYPERLINK"http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TW0-4Y7P8VF-1&_user=10&_coverDate=05%2F03%2F2010&_alid=1407848835&_rdoc=11&_fmt=high&_orig=search&_cdi=5548&_sort=r&_st=4&_docanchor=&_ct=1316&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=60fbed4b4fd8716afaa8c9cfd04fc033"Structure,magneticandelectricaltransportpropertiesK.L.Liu*Correspondingauthor.Address:DepartmentofPhysics,ZhoukouNormalUniversity,Zhoukou466000,PRChina.Tel:15936017799;E-mailaddress:liukuili@163.com,Y.D.Du,C.Y.LiDepartmentofPhysics,ZhenzhouelecticlpowercollagezhanghaiyangPeople’sRepublicofChina.ABSTRACTFe3O4powderswithhighlycrystallinehavebeensynthesizedbyasol-gelautocombustionsynthesismethodaccompanyingthermalprocess.Thephasestructures,morphologiesofFe3O4havebeencharacterizedbyx-raydiffraction(XRD)andscanningelectronmicroscopy(SEM)equippedwithenergydispersivex-rayspectrometer(EDX).Theresultsshowthatcompleteandhighlycrystallinenaturemagnetitepowderscanbeobtained.Furthermore,theroom-temperaturemagnetizationsandtheresistanceofFe3O4powderswerealsomeasured.ThemaximummagnetizationofsampleS1,S2andS3is88.3,87.32and89.4emu/gattheappliedmagneticfield5kOe,respectively,whicharelargerthanthesaturationmagnetizationofthebulkγ-Fe2O3(76emu/g).ItisprovedfurtherthatFe3O4powderscanbesynthesizedbythecitrate-nitratesol-gelautocombustionreactionmethod.Thepreliminaryreactionmechanismisalsodiscussed.Keywords:Fe3O4;Magneticmaterials;Sol-gelpreparation;Halfmetallic1.IntroductionMagnetite,Fe3O4,isferromagneticinversespinelstructurewithana