金属-稀土氧化物纳米复合粒子的制备与性能

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1、大连理工大学硕士学位论文金属/稀土氧化物纳米复合粒子的制备与性能姓名：俞快申请学位级别：硕士专业：材料科学与工程指导教师：董星龙20090601金属／稀土氯化物纳米复合粒子的制备与性能PreparationandPropertiesofMetal／RareEarthOxidesNanocompositeParticlesAbstractTherareearthoxides(REO)arewidelyusedinavarietyofdiverseapplicationssuchasrareearthpermanentmagnetm

2、aterials，lasersystem，catalyticmaterials，ceramicsandsuperconductors，whichduetotheiruniquepropertiesinoptical，electricandmagneticfields，justlikethesimplesubstanceofrareearths，becauseofpartiallyfilled4fshells。髓eFe／Y203，Fe／Sm203．Fe／Nd203andFe／Ce02nano—compositeparticlesw

3、erein-situsynthesizedbyevaporatingFe-RE0compactinaDCarcdischargechamber．Thesurfacemorphology，micro-structure，phases,thermalstabilityandelectromagneticcharacteristicsofaSpreparednanoparticleswerestudiedbymeansofX刚D，FT-IR，TEM膳浓TEM，TGA／DSCandVNA．TheXRDpatternsindicateth

4、attheexistingfo咖ofironiSa．Feinallofthesamples．誓heexistenceoftheshellcallnotbeeffectivelyreflectedbecauseitlSverythinandcouldbeanamorphousstate．ThecharacteristicinfraredabsorptionpeaksofRE．ObondcanbefoundbyFT-IRintherangeof4000-400cm～．whichprovethattheexisteneeofREO．A

5、nditwasalsofoundthatthespectrumofthemshowedanotableblueshiftcomparedwiththemicro．sizedrawmaterials．Inaddition，anewinfraredabsorptionband．whichnearby1000cm一，wasfoundinmostoftheFT-iRspectrum．Basedontherelatedresearchachievements,thisnewabsorptionpeakmustbeassociatedwit

6、htheformationofl乏E．o，FephaseduringtheintensereactionbetweenFeandREO．TheTEManalysisshowthatallfournanoparticlesarespherical．whichhasaclearcore。shellstructure。TheparticlediameterisaboutAfewdozentoahundrednanometers．andthethicknessoftheshelliSabout5．10nm．TheHRTEM，SAEDan

7、dCDFanalysisresultsshowthatthecompositionandmicro．structureofnanoparticlesareindeedthesameasweexpectation．Intheend．theformationofthenanocompositeparticleswhichhaveaclearcore／shelltypestructurecanbeexplainedbythemechanismof“stoichiometricoxygenassistantVLS”．KeyWords：N

8、ano；RareEarthOxides；Coating；Preparation；ElectromagneticProperties—I王一大连理工大学学位论文独创性声明作者郑重声明：所里交的学位论文，是本人在导师的指导下进行研究工作所取得的成果。尽我所知，除文中