Title :
Rare-earth transition metal carbides
Author :
Tang, Z.X. ; Singleton, E.W. ; Hadjipanayis, G.C.
Author_Institution :
Dept. of Phys. & Astron., Delaware Univ., Newark, DE, USA
fDate :
9/1/1992 12:00:00 AM
Abstract :
Methane and ethane were used to prepare rare-earth transition metal carbides. The structural and magnetic properties of these carbides have been studied. Interstitial carbon atoms expand the unit cell of the R2Fe17 (R=Y, Ce, Pr, Nd, Sm, Dy, Er) and RFe10M2 (R=Y, Nd, Sm and M=Mo, V) structures by about 7.5 and 1.5%, respectively. Thus lattice expansion resulted in increases of Curie temperature and spontaneous magnetization. The easy magnetization direction of Sm2Fe17 is changed from planar to uniaxial with the carbon uptake, while in other R2Fe 17 compounds it remains planar. For RFe10 M2 with R=Y and Nd, a uniaxial anisotropy is observed after carbonation
Keywords :
Curie temperature; X-ray diffraction examination of materials; cerium alloys; dysprosium alloys; erbium alloys; ferromagnetic properties of substances; induced anisotropy (magnetic); interstitials; iron alloys; lattice constants; molybdenum alloys; neodymium alloys; praseodymium alloys; samarium alloys; spontaneous magnetisation; vanadium alloys; yttrium alloys; Ce2Fe17Cx; Curie temperature; Dy2Fe17Cx; Er2Fe17Cx; Nd2Fe17Cx; NdFe10Mo2Cx; NdFe10V2Cx; Pr2Fe17Cx; Sm2Fe17Cx; SmFe10Mo2Cx; SmFe10V2Cx; X-ray diffraction; Y2Fe17Cx; YFe10Mo2Cx; YFe10V2Cx; carbonation; ethane; interstitials; lattice constants; lattice expansion; magnetic properties; methane; rare-earth transition metal carbides; spontaneous magnetization; uniaxial anisotropy; Carbon compounds; Erbium; Lattices; Magnetic field measurement; Magnetic properties; Magnetization; Neodymium; Powders; Temperature; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
