Magnetic properties of Fe-Al for quenched diluted spin-1 Ising model

We study the phase diagram of Fe1−qAlq alloys via the quenched site diluted spin-1 ferromagnetic Ising model by employing effective field theory. 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. In such model we propose the same kind of the exchange interaction in which the iron-nickel alloys obtain an excellent theoretical description of the experimental data of the T-q phase diagram for all Al concentration q.