A new theoretical approach to the Fe1−qAlq in the bcc lattice by employing effective field theory

In this work, a study on a site diluted Ising model system is applied to the magnetic properties of the bcc disordered phase of FeAl alloys by employing effective field theory. Here, one suggests a new approach to exchange interaction between nearest neighbors of Fe that depends on the powers of the Al ( q ) instead of the linear dependence proposed in other papers. With this, we find an excellent agreement for the description of experimental data and the phase diagram in the T − q plane, in particular, the region with anomalous behavior of the alloy concerned.