稀土永磁材料R_n Fe_m M_k化合物中的磁耦合作用

Magnetic Coupling Interactions In R_nFe_mM_k Intermetallic Compounds

本文用二格点分子场理论（MFT）分析了RFe_3，R_6Fe_23，R_2Fe_14B和RFe_10V_2（R＝稀土元系）稀土永磁材料中的Fe－Fe，R－Fe和R－R相互作用。计算了各种稀土（R＝Gd，D_Y，Tb，Ho，Er．Tm）铁化合物中的Fe—Fe，R－Fe和R－R相互作用对居里温度的贡献。结果表明，对于RFe_3，R_6Fe_23和R_2Fe_14B化合物，Fe－Fe相互作用对居里温度的贡献T_FF随稀土元素的原子序数的增大而减小；对于某些化合物，R—Fe磁耦合作用和R－R磁耦合作用对居里温度的贡献（T_RF和T_RR）有相同的量级。本文的计算值T_RF，与强磁场对自由粉末样品的测量结果基本一致。

The basic exhange interactions have been discussed for RFe3,R6Fe23 and R2Fe14V2 compound by using a two -sublattece molecular field th eory (MFT).For RFe3,R6Fe23 and R2Fe14B compounds the values of TFF,the contribution of Fe-Fe interaction to Curie temperature, decreasewith increading the atomic number of R components.The coupling coefficients of the RnFem(n/m+1/MFT have been compared with hign-field free-power measurment (HFFP).the results showthat for some compounds,the interaction of R-R and R-Fe has the same order.