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系统研究了室温下Tb0.3Dy0.6Pr0.1(Fe1-xAlx)1.95(x=0.05,0.1,0.15,0.2,0.25,0.3)合金中元素Al替代Fe对结构、磁致伸缩性能、自旋重取向温度和Mssbauer谱的影响.实验测量表明,x<0.2时Tb0.3Dy0.6Pr0.1(Fe1-xAlx)1.95合金基本上是纯的单相,x=0.2出现其他杂相,且杂相随Al替代量的增加不断增多.随Al替代量x的增加磁致伸缩系数快速减小,x>0.15时巨磁致伸缩效应消失,而且少量Al的加入有利于降低磁晶各向异性.相对磁化率随温度的变化测量表明,自旋重取向温度Tm随Al替代量的增多而降低.Mssbauer谱的测量发现,随Al含量的增加,易磁化轴可能在{110}面逐渐偏离了立方晶体的主对称轴,即发生自旋重取向.对Mssbauer谱的分析表明:随Al替换量x的增多,平均超精细场Hhf减小,而同质异能移IS增大,四极劈裂QS则呈无规律的变化.
The effect of elemental Al substitution on the structure, magnetostriction, spin-spin (Tb) Orientation temperature and Mssbauer spectrum.Experimental measurements show that the Tb0.3Dy0.6Pr0.1 (Fe1-xAlx) 1.95 alloy is almost pure single phase when x <0.2, other hetero phases appear at x = 0.2, With the increase of Al substitution amount, the magnetostriction coefficient decreases rapidly, while the giant magnetostriction effect disappears when x> 0.15, and addition of a small amount of Al is helpful to reduce the magnetocrystalline anisotropy. Measurement of relative magnetic susceptibility with temperature shows that the spin reorientation temperature Tm decreases with the increase of Al substitution.The measurement of Mssbauer spectra shows that the easy axis of magnetization may deviate gradually from the {110} plane with increasing Al content The main symmetry axis of the cubic crystal, that is, spin reorientation.The analysis of Mssbauer spectrum shows that with the increase of Al substitution amount x, the average hyperfine field Hhf decreases and the isomerism IS increases, Quadrupole splitting QS showed a non-regular change.