Structure evolution and entropy changes of Ga0,7Bi0,3 liquid alloy

摘要

Structure of Ga0,7Bi0,3 has been studied by means of X-ray diffraction method reverse Monte-Carlo simulations at different temperatures. Temperature dependences of structure factors and parameters obtained from them are analysed. Most probable interatomic distances, mean and mean root square distances have been calculated from pair correlation functions and used for estimation of thermal expansion coefficients at short-range-order scale. It is shown that untypical behaviour of these coefficients is related to free volume evolution from critical point to higher temperatures. Based on the temperature dependencies of partial interatomic distances and coordination numbers, as well as free volume distribution, a temperature interval of transition of a melt from a microheterogeneous to a microhomogeneous state was established.