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1、INSTITUTEOFPHYSICSPUBLISHINGSUPERCONDUCTORSCIENCEANDTECHNOLOGYSupercond.Sci.Technol.19(2006)12821284doi:10.1088/0953-2048/19/12/011HybridmicrowavesynthesisofMgCNi3superconductorQLXia1,JHYi1,JWHuang2,TMYe1,YDPeng1andLYLi11SchoolofPhysicalScienceandTechnologyandStateKeyLaboratoryfo
2、rPowderMetallurgy,CentralSouthUniversity,Changsha410083,PeoplesRepublicofChina2ChangshaLongtechCo.Ltd,Changsha410013,PeoplesRepublicofChinaE-mail:qlxia@mail.csu.edu.cnandqlxiacsu@126.comReceived16August2006,infinalform17October2006Published6November2006Onlineatstacks.iop.org/SUST/
3、19/1282AbstractThesuperconductorMgCNi3,anintermetalliccompoundwithacubicperovskitecrystalstructure,wassynthesizedfromMg,Niandgraphitepowdersbyhybridmicrowaveheatinginashorttime.Thephases,microstructuresandsuperconductivitywerecharacterizedusingx-raydiffraction,energydispersivex-r
4、ayanalysis,scanningelectronmicroscopy,thestandardfour-probemethodandmagneticmeasurements.TheresultsindicatethatthephasesofthesynthesizedsampleareMgCNi3(majorphase),asmallamountofunreactedgraphiteandalittleMgO.TheMgCNi3particlesizesrangefromtwotoseveralmicrons.Theonsetsuperconduct
5、ingtransitiontemperatureoftheMgCNi3samplewas6.9K,andthesuperconductingtransitionwidthwasabout0.8K.1.IntroductionTherecentlydiscoveredsuperconductorMgCNi3[1]withaperovskitestructurehasattractedrenewedattention,becauseitisanewintermetalliccompoundfollowingtheremarkablediscoveryofMg
6、B2[2]andisthoughttobeveryclosetoferromagnetismduetoalargeproportionofNiineachunitcell[3,4].ExperimentshaveshownthatthesuperconductivityinMgCxNi3isverysensitivetothecontentofcarbonanddisappearsbelowaboutx=0.88[1].DifferentmethodsofpreparationofMgCNi3,includingrepeatedsintering[1,4
7、],sinteringforalongtime[3]andmechanicalalloying,havebeenproposed[5,6].Tothebestofourknowledge,therearenoreportsonmicrowavesynthesisofMgCNi3superconductor.MicrowavesynthesisisaverypromisingpreparationFigure1.MicrowavemultimodecavityoftheLongtechmicrowavemethodformanymaterialsbecau
8、seitisfast,cleanandoven:(1)windowfortemp
