Crystal structure and magnetic properties of melt spun SmCo7−xMx (M=Ta, Cr, and Mo; x=0–0.6) ribbons

The crystal structure and magnetic properties of melt spun SmCo7−xMx (M=Ta, Cr, and Mo; x=0–0.6) ribbons have been investigated. Based on x-ray diffraction analysis, it is found that a pure TbCu7-type structure is formed in the melt spun SmCo7−xTax (x=0–0.3) ribbons, while minor amount of additional 2:17 phase appears for the SmCo7−xMx (M=Cr and Mo; x=0.1–0.6) ribbons, implying that the elements in VIB group (Cr and Mo) are inferior to the element in VB group (Ta) in stabilizing metastable 1:7 phase. The result, analyzed by Rietveld refinement method, shows that Ta, Cr, and Mo may occupy the 2e site of 1:7 phase, which leads to the enhancement of the magnetic anisotropy field of 1:7 phase, just like Ti, Zr, Hf, Nb, or V did. From the magnetic performance point of view, with increasing the content of doping element x from 0 to 0.6, the maximum coercivity of SmCo7−xMx ribbons is enhanced from 1.9 kOe for binary SmCo7 to 11.3 kOe for M=Ta, 6.6 kOe for M=Cr, and 7.5 kOe for M=Mo, respectively, while the reman...

[1]  J. Yi,et al.  Phase transformation, grain refinement and magnetic properties in melt-spun SmCo7−x(Cr3C2)x (x = 0–0.25) ribbons , 2009 .

[2]  W. Li,et al.  Magnetic properties, phase evolution, and structure of melt spun SmCo7−xNbx (x=0–0.6) ribbons , 2009 .

[3]  H. Chang,et al.  Crystal structure and magnetic properties of melt spun Sm(Co,V)7 ribbons , 2009 .

[4]  Chengbao Jiang,et al.  Structural and magnetic properties of SmCo7-xMox alloys , 2009 .

[5]  J. Zhang,et al.  Structure and magnetic properties of bulk nanocrystalline SmCo6.6Nb0.4 permanent magnets , 2007 .

[6]  Y. Yao,et al.  Comparison on the magnetic properties and phase evolution of melt-spun SmCo7 ribbons with Zr and Hf substitution , 2007 .

[7]  Y. Yao,et al.  Magnetic properties, phase evolution, and microstructure of melt spun SmCo7−xHfxCy (x=0–0.5; y=0–0.14) ribbons , 2007 .

[8]  W. Li,et al.  Magnetism and phase stability of R(Co,M)7 pseudobinary intermetallics with TbCu7-type structure , 2007 .

[9]  S. Aich,et al.  Effect of Nb and C Additives on the Microstructures and Magnetic Properties of Rapidly Solidified Sm-Co Alloys , 2006 .

[10]  Zongxin Zhang,et al.  Structure, phase transformation, and magnetic properties of SmCo7−xCrx magnets , 2006 .

[11]  Quanlin Liu,et al.  Effects of the doping element on crystal structure and magnetic properties of Sm(Co,M)7 compounds (M=Si, Cu, Ti, Zr, and Hf) , 2005 .

[12]  W. Li,et al.  Structural stability and magnetic properties of SmCo7−xGax , 2005 .

[13]  Jingkui Liang,et al.  Crystal structure and magnetic properties of SmCo7−xHfx compounds , 2004 .

[14]  Jingkui Liang,et al.  Crystal structure and magnetic properties of SmCo5.85Si0.90 compound , 2004 .

[15]  Ralph Skomski,et al.  Sm–Co–Cu–Ti high-temperature permanent magnets , 2000 .

[16]  D. Sellmyer,et al.  Magnetic and structural properties of SmCo7-xCux alloys , 2000 .

[17]  J. Liu,et al.  Structure and magnetic properties of SmCo7−xTix with TbCu7-type structure , 2000 .

[18]  M. McHenry,et al.  Structure and magnetic properties of SmCo7−xZrx alloys (x=0–0.8) , 1998 .

[19]  K. Buschow,et al.  Composition and crystal structure of hexagonal Cu-rich rare earth–copper compounds , 1971 .