Mossbauer spectroscopy studies in supersaturated FexCo 50-xCu50 solid solutions

Local structural change in mechanically alloyed Fe_xCo _50-xCu₅₀ (x=10, 20, 30, 40 and 50) powders has been investigated by Mossbauer spectroscopy and X-ray diffractometry at room temperature. Mossbauer spectra from mechanically alloyed Fe_x Co_50-xCu₅₀ samples consist of three different subspectra: a sextet, a broad sextet and a doublet corresponding to an α-Fe phase, to a disordered ferromagnetic phase of fcc solid solution, and to a non-ferromagnetic phase, respectively. With increasing processing time, the disordered ferromagnetic phase becomes dominant, indicating a formation of fcc solid solution during mechanical alloying. With increasing Co content, the hyperfine field of the disordered magnetic phase increases from about 20 to 25 T