中国物理B ›› 1994, Vol. 3 ›› Issue (4): 297-302.doi: 10.1088/1004-423X/3/4/007

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STRUCTURE AND MAGNETIC PROPERTIES OF LaCo13-BASED ALLOYS

鄢晓华, 梁敬魁   

  1. Institute of Physics, Academia Sinica, Beijing 100080, China
  • 收稿日期:1993-06-25 出版日期:1994-04-20 发布日期:1994-04-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China.

STRUCTURE AND MAGNETIC PROPERTIES OF LaCo13-BASED ALLOYS

YAN XIAO-HUA (鄢晓华), LIANG JING-KUI (梁敬魁)   

  1. Institute of Physics, Academia Sinica, Beijing 100080, China
  • Received:1993-06-25 Online:1994-04-20 Published:1994-04-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China.

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摘要： The structure and magnetic properties of two series of LaCois-based alloys, LaCo13-xFex(0≤x≤6) and La1-xRx(Co, Fe)13 (x=0.1,0.2; R=Y, Ge, Pr, Nd Sm, Gd, Tb, Dy, Ho, Er, and Yb), are studied by X-ray diffraction and magnetic mea- surements. In the above-mentioned composotions, all the samples display a structure of NaZn13 type (space group: Fm3c). In LaCo13-xFex system, as the iron content increases, its Curie temperature decreases, while thc magnetic moment per 3d atom increases. This may be explained by a rigid band model. In the other alloy system, the Curie temperature goes through a maxium at R=Gd, and this reflects the influ- ence of R - T interaction. It is also observed that saturation magnetization varies with R and gets lower when R is a heavy rare earth element. The contribution of R is close to that of a free-ion moment. La0.9Pr0.1Co9Fe4 has the largest value 29μB/f.u.

Abstract: The structure and magnetic properties of two series of LaCois-based alloys, LaCo13-xFex(0≤x≤6) and La1-xRx(Co, Fe)13 (x=0.1,0.2; R=Y, Ge, Pr, Nd Sm, Gd, Tb, Dy, Ho, Er, and Yb), are studied by X-ray diffraction and magnetic mea- surements. In the above-mentioned composotions, all the samples display a structure of NaZn13 type (space group: Fm3c). In LaCo13-xFex system, as the iron content increases, its Curie temperature decreases, while thc magnetic moment per 3d atom increases. This may be explained by a rigid band model. In the other alloy system, the Curie temperature goes through a maxium at R=Gd, and this reflects the influ- ence of R - T interaction. It is also observed that saturation magnetization varies with R and gets lower when R is a heavy rare earth element. The contribution of R is close to that of a free-ion moment. La0.9Pr0.1Co9Fe4 has the largest value 29$\mu$B/f.u.

中图分类号:  (Alloys )

  • 61.66.Dk
75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 61.50.Ah (Theory of crystal structure, crystal symmetry; calculations and modeling) 75.30.Cr (Saturation moments and magnetic susceptibilities) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 75.50.Gg (Ferrimagnetics)