Abstract
X-ray-absorption fine-structure data of the metal-absorption edges in the amorphous Fe40 Ni40 P14 B6 and Co70(Si,B)23 Mn5(Fe,Mo)2 alloys suggest segregation into microphases with different stoichiometric compositions; in the first case the material contains microphases consisting mainly of Ni and P and others of mainly Fe and B. The second material contains microphases with mainly Co-Si stoichiometry and a Mn-Fe-Mo-B mixture in the remaining part of the sample.