Density and heat capacity of some molten mixtures in system LiF-BeF2-UF4

Abstract The density of molten mixtures of lithium, beryllium and uranium fluorides was studied by Archimedean method. The densities of mixtures without UF4 are of close values, uranium fluoride increases density. Heat capacity was measured by DSC method. There is some difference between results obtained in cooling and heating modes due to presence of peritectic compound Li2BeF4 which manifests overcooling behavior. The dependence of specific and molar heat capacity on composition was drawn for LiF-BeF2 system. The thermal expansion values were calculated from density results. Correlation was found between heat capacity and thermal expansion of melts studied.