Vasily Lutsyk

Abstract:

The aim of this work is the development of computer models of phase diagrams (PD) for the ternary systems contained on the boundaries of LiF-NaF-KF-PuF3 system. The data about the structure of binary systems and the topological structure of primary crystallization surfaces is a basis for reproducing of full geometric structure of PD, including the phase regions with melt as well as the solid phase regions. By using the diagrams of vertical mass balance (which permit to analyze the quantitative content of phases in the whole temperature range for the given composition) we produced the investigation of two, one and zero-dimensional concentration fields for each studied system, compiled the lists of intersecting surfaces and phase regions and formed the schemas of phase reactions and sets of microconstituents elements. As a result, the concentration fields with the same or unique sets of microconstituent elements are identified.<br />The schemas of mono- and invariant transformations and the data about the structure of ternary systems PD are the base for producing the prototype of PD for quaternary system LiF-NaF-KF-PuF3, which can be a theoretical basis for its experimental study.<br />The obtained models of PD bounding LiF-NaF-KF-PuF3 system can be used for the prediction of the properties of fuel composition for molten-salt reactor.<br />The work was partially supported by the Russian Foundation for Basic Research (projects 14-08-00453 and 14-08-31468).