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本文系统研究了室温下Tb_(0.3)Dy_(0.7)(Fe_(0.9)T_(0.1))_(1.95)(T=Mn,Fe,Co,B,Al,Ga)合金中ⅢA族金属和过渡金属T替代Fe对晶体结构、磁性能、磁致伸缩和自旋重取向温度的影响。结果发现,不同金属T替代Fe,Tb_(0.3)Dy_(0.7)(Fe_(0.9)T_(0.1))_(1.95)合金具有相同的MgCu_2型立方Laves相结构。除Co之外,其它金属替代均使合金的点阵常数有不同程度的增大,而Curie温度有所降低。T替代Fe使合金的比饱和磁化强度增大。ⅢA族金属B,Al,Ga替代使磁致伸缩λ_s下降幅度较大,而且Al,Ga替代使磁致伸缩容易饱和,表明Al,Ga替代可降低合金的磁晶各向异性,而过渡金属Mn,Co替代Fe使合金磁致伸缩λ_1下降幅度较小,不同替代金属元素,对内禀磁致伸缩λ_(111)有不同的影响。同时还发现,替代使合金的自旋重取向温度略有下降。
In this paper, we studied systematically the transition of Group IIIA metals in Tb_ (0.3) Dy_ (0.7) (Fe_ (0.9) T_ (0.1)) _ (1.95) (T = Mn, Fe, Co, B, Al, Ga) Effect of Metal T Replacing Fe on Crystal Structure, Magnetic Properties, Magnetostriction, and Spin Reorientation Temperature. The results show that the substitution of different metals T for Fe and Tb_ (0.3) Dy_ (0.7) (Fe_ (0.9) T_ (0.1)) _1 (1.95) alloys has the same MgCu_2 cubic Laves phase structure. Except for Co, all the other metal substitutions increased the lattice constant of the alloy to some extent, while the Curie temperature decreased. T replaced by Fe alloy saturation magnetization increased. Substitution of Group IIIA metals B, Al, Ga resulted in a larger decrease of magnetostriction λ_s, and Al, Ga substitutions made it easier to saturate magnetostriction, indicating that substitution of Al and Ga reduced the magnetocrystalline anisotropy of the alloy, whereas transition metal Mn , The substitution of Fe for Co makes the decrease of the magnetostriction λ_1 smaller, and the substitution of different metal elements has different effects on the intrinsic magnetostriction λ_ (111). At the same time, it was also found that the substitution decreased the spin reorientation temperature slightly.