摘要
T>T_N 时 Fe-Mn 合金表现 Paulli 顺磁性。当 Mn 含量增加时,T_N 提高,但磁化率下降,这是由于 Fe-Mn 间的正交换作用远小于 Mn-Mn 间的负交换作用。顺磁性金属 Al 的加入使Fe-Mn-Al 合金在 T>T_N 时表现出 Curie-Weiss 行为,Al 含量提高导致 T_N 下降,Al 含量超过5.5wt-%时,出现铁磁性相。
The Fe-Mn alloys display paulli paramagnetism in the temperature rangeof T>T_N.The T_N point increases and the susceptibility decreases with increasing Mn con-tent,because the positive exchange interaction of Fe-Mn atoms is smaller than negative ex-change interaction of Mn-Mn atoms.Addition of paramagnetic metal Al results inCuris-Weiss behaviour of the alloy in the range of T>T_N.The increase of Al contentcauses the decrease of T_N,and ferromagnetic phase appears in the alloy when the Al con-tent is higher than 5.5wt-%.
