有序-无序转变对FeAl金属间化合物磁性能的影响应当引起重视.许多实验和理论研究表明完全有序的FeAl是无磁的.但是,可以通过非平衡技术使FeAl无序化,如快速凝固、冷加工、溅射、共蒸发和机械合金化.本文利用固体与分子经验电子理论(EET)和Jaccarino-Walker模型对此进行了研究,结果表明,完全无序的FeAl是铁磁性的,每个Fe原子的平均原子磁矩是1.41μB.
The effect of order-disorder on magnetic properties of FeAl intermetallic deserves much attention. Many experimental and theoretical studies indicate that perfect ordered FeAl is nonmagnetic. However, the long-range order of ordered FeAl could be destroyed by non-equilibrium techniques, such as rapid quenching, cold-working treatment, sputtering, co-evaporation and mechanical alloying. Based on the empirical electron theory of solid and molecule (EET) and Jaccarino-Walker model, our calculation predicts that the completely disordered FeAl is ferromagnetic and has the average magnetic moment of 1.41μB per Fe atom.
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