Title :
Effects of Cr substitution on the formation, structure and magnetic properties of Sm2(Fe,Cr)17Cx alloys
Author :
Chen, Zhongmin ; Hadjipanayis, G.C.
Author_Institution :
Dept. of Phys. & Astron., Delaware Univ., Newark, DE, USA
fDate :
9/1/1997 12:00:00 AM
Abstract :
The effects of Cr substitution on the formation, structure and magnetic properties of Sm2(Fe,Cr)17Cx alloys have been systematically studied on arc-melted and melt-spun samples using XRD, TEM and magnetic measurements. It has been found that Cr substitution is an effective way to form the Sm2(Fe,Cr) 17Cx carbides. The minimum amount of Cr needed to form an almost single 2:17 Sm2Fe17-yCryC2 phase is around y=2 and the maximum amount of carbon for Sm2Fe15 Cr2Cx to remain in a single 2:17 structure is around x=2. Magnetic measurements reveal that the Cr substituted Sm 2(Fe,Cr)17Cx carbides have a strong uniaxial magnetocrystalline anisotropy with anisotropy fields higher than 90 kOe obtained in both the Sm2Fe15Cr2 C2 and Sm2Fe14Cr3C2 carbides. The highest coercivity of 13.2 kOe has been obtained in Sm2Fe15Cr2C2 melt-spun ribbons. However, both the Curie temperature and the magnetization are found to decrease with Cr substitution
Keywords :
Curie temperature; X-ray diffraction; alloying additions; chromium alloys; coercive force; ferromagnetic materials; iron alloys; lattice constants; magnetic anisotropy; magnetic hysteresis; magnetisation; materials preparation; melt spinning; permanent magnets; samarium alloys; transmission electron microscopy; 2:17 structure; Cr substitution effect; Curie temperature; Sm2(Fe,Cr)17Cx alloys; Sm2Fe14Cr3C2; Sm2Fe15Cr2; Sm2Fe15Cr2C; Sm2Fe15Cr2C2; Sm2Fe15Cr2C3; Sm2Fe16CrC2; Sm2Fe17C2; TEM; XRD; alloy formation; anisotropy fields; arc-melting; coercivity; lattice constants; magnetic measurements; magnetic properties; magnetization; melt-spinning; melt-spun ribbons; structure; uniaxial magnetocrystalline anisotropy; unit-cell volumes; Anisotropic magnetoresistance; Chromium alloys; Coercive force; Iron; Magnetic anisotropy; Magnetic properties; Magnetic variables measurement; Perpendicular magnetic anisotropy; Samarium alloys; X-ray scattering;
Journal_Title :
Magnetics, IEEE Transactions on
