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综述了作者测定的R-Co-B三元系R=Nd,Pr,600℃长时间退火和R=Sm,Gd,700℃长时间退火的等温截面相关系。应用结构组合概念,对于R_m+_nCo_(5m)+_(3n)B_(2n)化合物设计合成了m=2,n=1的R_3Co_(13)B_2(R=Nd,Pr,Sm,Gd,Dy,Ho,Er,Y)和m=2,n=3的R_5Co_(19)B_6(R=Pr,Nd)新型化合物。用X射线粉末衍射和Rietveld峰型拟合法测定并修正了它们的晶体结构以及化合物的易磁化方向,应用振动样品磁强计、提拉样品磁强计以及不同磁取向样品的M(H)-H曲线,测定了新化合物R_3C0_(13)B_2和R_5Co_(19)B_6的Curie温度T_c、饱和磁化强度M_8和各向异性场H_A。R_(m+n)Co_(5m)+3_(2n)在相同n的情况下,随m值的增加,化合物的T_c和M_s增大,在m相同的情况下,随n值的增加,H_A增大。并研究了Ni部分替代Nd_3Co_(13)B_2中的Co,对Nd_3Co_(13-x)Ni_xB_2化合物磁性的影响,Ni含量的增加,自旋转变温度T_(SR)单调的降低,并在x=3时室温下磁化方向为易轴,讨论了R_(m+n)Co_(5m)+_(3n)B_(2n)的晶体结构与磁性能的关系,探讨了作为永磁材料的可能的合成途径.
The R-Co-B ternary system, R = Nd, Pr, measured at a long time of 600 ℃ and isothermal cross-section of R = Sm, Gd and 700 ℃, is reviewed. The structure of R_mCo_ (13) B_2 (R = Nd, Pr, Sm, Gd, Dy) with m = 2 and n = 1 was designed and synthesized for the compounds Rm + _nCo_ (5m) , Ho, Er, Y) and R_5Co_ (19) B_6 (R = Pr, Nd) compounds with m = 2 and n = The crystal structure and the easy magnetization direction of the compounds were determined and corrected by X-ray powder diffraction and Rietveld peak fitting method. The vibrational properties of M (H) - H curve, the Curie temperature T_c, saturation magnetization M_8 and anisotropy field H_A of the new compounds R_3C0_ (13) B_2 and R_5Co_ (19) B_6 were measured. In the case of the same n, the values of T_c and M_s increase with the increase of the value of m. In the same case of m, with the increase of the value of n, H_A (m + n) Co_ (5m) +3_ Increase. The effects of Ni substitution on the magnetism of Nd_3Co_ (13-x) Ni_xB_2 compounds were also studied. The results show that the Ni content is increased and the spin transition temperature T_ (SR) When the magnetization direction at room temperature is easy axis, the relationship between the crystal structure and magnetic properties of R_ (m + n) Co_ (5m) + _ (3n) B_ (2n) was discussed and the possible synthesis route was discussed .