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Structure and magnetic properties of Nd2(Fe1-xCox)14B1-y Cy alloys

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5 Author(s)
Sun, X.K. ; Inst. of Metal Res., Acad. Sinica, Shenyang, China ; Kou, X.C. ; Chuang, Y.C. ; Grossinger, R.
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The reorientation temperature and magnetocrystalline anisotropy field (Ha) of Nd2(Fe1-xCox)14B1-y Cy in the temperature range 200-450 K were determined by AC initial susceptibility measurements and the singular point detection technique, respectively. The temperature dependence of saturation magnetization was measured on finely powdered polycrystalline samples in an extraction magnetometer in fields up to 80 kOe. It was found that the Nd2(Fe1-xCox)14 C (X⩽0.4) series consisted of a mixture of two phases, Nd2(Fe,Co)17Cx and α-(Fe,Co), irrespective of heat treatment schedules. Partial substitution of C for boron led to a slight increase of Ha, whereas substitution of Co for Fe (at low Co concentration) causes an increase of Ha at low temperature. Although the concentration dependence of Ms is reminiscent of the Slater-Pauling curve, no maximum was found at either 1.5 K or 300 K, as one would expect in Fe-Co and Nd2(Fe,Co)14B alloys

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Magnetics, IEEE Transactions on  (Volume:25 ,  Issue: 5 )