STRUCTURE OF FE-SI-MELTS BY X-RAY-DIFFRACTION

X-ray diffraction was done with molten Fe66.7Si33.3 and molten Fe33.3S i66.7. The coordination numbers versus the concentration lie above the connection line between the coordination numbers of the unalloyed mol ten elements Fe and Si, respectively, which means a tendency for micro segregation. The pair correlation function of molten Fe66.7Si33.3 was modeled using the data of crystalline Fe2Si. At the same time, the pai r correlation function of the molten alloy Fe33.3Si66.7 can be modeled using the data of the corresponding crystalline alloy. Thus for molte n Fe33.3S66.7 into FeSi2 and Si or FeSi and for molten Fe66.7Si33.3 mi crosegregation into Fe2Si and Fe or FeSi exists.