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

Volume

28

Issue

5

fYear

1992

fDate

9/1/1992 12:00:00 AM

Firstpage

2572

Lastpage

2574

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; Ce₂Fe₁₇C_x; Curie temperature; Dy₂Fe₁₇C_x; Er₂Fe₁₇C_x; Nd₂Fe₁₇C_x; NdFe₁₀Mo₂C_x; NdFe₁₀V₂C_x; Pr₂Fe₁₇C_x; Sm₂Fe₁₇C_x; SmFe₁₀Mo₂C_x; SmFe₁₀V₂C_x; X-ray diffraction; Y₂Fe₁₇C_x; YFe₁₀Mo₂C_x; YFe₁₀V₂C_x; 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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.179560

Filename

179560