Physico-Chemical nanomaterials science 

NANOCLUSTER STRUCTURE OF LIQUID INTERMETALLICS
Oliinyk Z.M.1, Korolyshyn A.V.1, Mudry S.I.1
1 Department of Physics, Physics Department, Ivan Franko National University of Lviv, 8 Kyrylo and Mefodiy St., Lviv, 79005, Ukraine
E-mail: zachar908@gmail.com

It is known that metallic alloys show the various kind of atomic and phase structure, information on which can be commonly taken from phase diagrams. Unfortunately, such information is available only for alloys whose temperature is less then liquidus curve. Liquid phase is considered as atomic solution with random atomic arrangement that is not correct, especially for molten intermetallics, most of which reveal both topologic and chemical short-range order. In order to explain the structure of liquid intermetallics from viewpoint of thermodynamics the quasi-chemical model is widely used. But this model showed the restriction in ability to describe an atomic arrangement in liquid state. On that reason we propose to interpret the diffraction data for molten intermetallics by combining of compound forming models with cluster description of structure.
It was supposed that molten intermetallics consists both of clusters, in which the atomic arrangement is similar to structure in crystalline state and matrix with random atomic distribution. Taking into account this assumption we have calculated the diffraction patterns for liquid intermetallics, existing at temperatures up to melting point in Cu-In and Cu-Si binary systems. Such calculated diffraction curves have been fitted to experimental ones that allowed us to determine the parameters of nanoscale structure.