Fe基球磨-Fe基稀土金屬間化合物的結(jié)構(gòu)和物性研究.pdf

1、中國科學技術(shù)大學碩士學位論文Fe基球磨Fe基稀土金屬間化合物的結(jié)構(gòu)和物性研究姓名：林磊申請學位級別：碩士專業(yè)：凝聚態(tài)物理指導教師：李玉芝2000.5.1主塑型墊查蘭堡主笙莖型!!堡豎AbstractM6ssbauerspectroscopyisverypowerfultooltoinvestigatetheelectronicstateandatomicsurroundingoftheM0ssbanernucleusduetoitshi

2、ghsensitivityandresolutioncapabilityofenergyInthisthesis，themicrostructureandthephysicalpropertiesofthemechanicallyalloyedFeCu，F(xiàn)eSiandtheiron—basedrare—earthtransition—metalintermetalliccompoundDy2Fet7xGaxwereinvestigate

3、dbyamajormethod，M6ssbauerspectrometrycombiningwithXRD：RamanandmagneticmeasurementThesamplesFeo4Cu06andFeo5Cu05ballmilledfur50hareinvestigatedbyX—raydiffractionM6ssbauerspectraaswellasmagneticmeasurementTheexperimentsshow

4、thatthestructureofthesamplesisfcc，withlatticeconstantO361nmandtherearefeeFe—richphaseandfecCu—richphaseinthesamplesMostofFeatoms(91％)areinthefccFe—richphase，whichisaferromagneticphaseTheM—Hcurveat15Kshowsthesaturationmag

5、netizationofthesamplesare805emu／gand1016emu／gfurFe04Cuo6andFe05Cuo5respectivelyTheaveragemagneticmomentofFeatomsisdeducedtobe240PBComparedwiththeoreticalpredication，theFeatomsinthefccphaseareinhighspinstate，ThesampleFe03

6、Sio7ismilledfor20，40，50，60and80hoursrespectivelythenannealedinMufflefurnaceat950。CforonehourandcooledinairThestudyofM6ssbanerspectra，combiningwithXraydiffractionpatternsaswellasRamanscatteringspectra，showsthattheaFeSi2，a

7、stablephase，existsaccompanyingwith3FeSi2Theoriginofo【一FeSi2hastwoways：1ThemainiscompoundedfromparticulateofFeandSimilledinannealingprocess；2Afewistransitedfrom13FeSi2Inaddition，theratioofironoxideisonlyabout10％ThesampleF

8、e06Sio4ismilledfor10，20，30，40and60hoursrespectivelythenannealedinMufflefurnaceat600。Cand1000。CrespectivelyfuronehourandcooledinairThestudyofMOssbauerspectra，combiningwithXraydiffraction，showsthatafterannealinginMufflefur