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1、北京交通大學(xué)碩士學(xué)位論文Fe-Ni合金/W型鐵氧體納米復(fù)合材料的吸波性能研究姓名:鄭仕欽申請學(xué)位級別:碩士專業(yè):材料物理與化學(xué)指導(dǎo)教師:朱紅20080601j匕塞交道叁堂亟±堂僮論室△旦墨工曼△g!ABSTRACTABSTRACT:W-typeferriteshavebeenusedaspermanentmagnetsformicrowavedevices,forhigh—densitymagneticrecordingandforbubbledomainmemoriesintheformofthinmonocryst
2、allinelayersduetotheirrelativelystronganisotropyandmoderatedmagnetization.Fine—particleferritesshowmagneticpropertiesdiferentfromsinteredmaterials.Awiderangeofchemicalmethodsinthesolutionsuchassot-gel,chemicalcoprecipitation,四asscrystallizationmethodhavebeenused
3、toobtainultrafinemixedparticles.Incomparisionwiththeclassicalceramicmethods,thesemethodshavemanyadvantagesasfollows:Theyreducereactiontemperatures;Thereisafinerandmorehomogenousgranulometryintheobtainedferrites;Magneticpropertieshavegreatlybeenimprovedunderthesa
4、mesinteredtemperatureWehavet訂edtosynthesizeW—typeferritebycitricacidmethod.Wehavet矗edtosynthesizeW—typeferriteandFe—NinanoparticlecompositesbycitricacidmethodWecomposeW·-typeferriteandFe-·Ninanoparticlecompositesintoferrite/Fe—Ninanoparticlecomposites.Thesamples
5、werecharacterizedbyX-raydifraction(XRD)analys,transmissionelectronmicroscopy(TEM)TheelectromagneticcharacteristicsofteFe,Co,NinanoparticlescompositesweremeasuredbyAgilent8722ESmicrowavenetworkanalyzerinthebandof2~18GHz—Theexperimentalresultsshowthatthedopantsoft
6、heFe—NinanoparticlecompositescallaltermicrostructuresandmagneticpropertiesofW-typeFerrites,andtheeffectsaremuchgreatly.ThedopantsoftheFe-Ninanoparticlecompositescanalsoincreastthevalueof曠.WhiletheratioofFe.NinanoparticlecompositesandW—typeferriteisO.1.theeffecti
7、sthegreatest.KEYWORDS:Radarabsorbingmaterials;W-typeferrites;Fe-Ninanoparticlecomposites;AbsorbingpropertyCI.ASSNo:TB332學(xué)位論文版權(quán)使用授權(quán)書本學(xué)位論文作者完全了解北京交通人學(xué)有關(guān)保留、使用學(xué)位論文的規(guī)定。特授權(quán)北京交通入學(xué)可以將學(xué)位論文的全部或部分內(nèi)容編入有關(guān)數(shù)據(jù)庫進(jìn)行檢索,并采圳影印、縮印或掃描等復(fù)制手段保存、匯編以供查閱和借閱。同意學(xué)校向國家有關(guān)部門或機(jī)構(gòu)送交論文的復(fù)印件和磁盤。(保密的學(xué)位論文
8、在解密后適川本授權(quán)說明)導(dǎo)師簽名:彳求≠乙簽字日期:獬年磊/日飲日食G莎月蓖6名乒彌肼者々忙:文期論日位字學(xué)簽獨(dú)創(chuàng)性聲明本人聲明所呈交的學(xué)位論文是本人在導(dǎo)師指導(dǎo)下進(jìn)行的研究T作和取得的研究成果,除了文中特別加以標(biāo)注和致謝之處外,論文中不包含其他人已經(jīng)發(fā)表或撰寫過的研究成果,也不包含為獲得北京交通入學(xué)或其他教育機(jī)構(gòu)的學(xué)位或證二傳而使