MAGNETIC PROPERTIES OF Nd_2(Fe_(1-x)M_x)_(14)B(M=C, Si) ALLOYS

The magnetic properties of Nd_2(Fe_(1-x)M_x)_(14)B (M=C, Si) compounds have been investigated. Substituting Fe by a small amount of metalloid C and Si atoms, the compounds are in tetragonal structure and have uniaxial anisotropy. The substitution of C for part of Fe makes the Curie temperature and the intrinsic coer- civity of bond samples decrease at low temperature. The replacement of Fe by Si makes the Curie temperature increase with a maximum at the vicinity of x=0. 15. When the range of the content of Si is 0≤x≤0.10, the coercivity distinctly in- creases at room temperature, from 62.7 kA/m at x=0 to 138.7kA/m at x=0.06, where the residual magnetization has a maximum; at the mean time the saturation magne- tization decreases only by a small amount.