CALCULATION AND 3D MODELING OF THE GIBBS ENERGY AND LIQUIDUS SURFACES OF THE YbTe-Sb2Te3- Bi2Te3 SYSTEM

Abstract

In this work by using the liquidus equation applied to the YbTe-Sb2Te3-Bi2Te3 quasiternary system consisting of non-molecular compounds an approximation and 3D modelling of crystallization
surfaces and partial excess Gibbs free energy for YbTe were carried out. The equations were solved
on the basis of limited number of experimental points on the phase diagram and published data on
boundary systems. The surfaces of the crystallization and partial excess free energy of YbTe were 3D
visualized for high-temperature region (1000 ÷ 2000 K) of YbTe-Bi2Te3-Sb2Te3 systems in the concentrations range 0.25 ÷ 1.0 mole fraction of YbTe on sections x /(x + x )= Bi Bi Sb 2 2 2 Te Te Te 3 3 3 0 ÷1. The approximation, calculation and visualization of crystallization surfaces and partial excess Gibbs free
energy of YbTe were performed by the program OriginLab2015 and Grafikus.ru/plot3d.
Keywords: calculation, approximation,3D modeling, Gibbs free energy,liquidus YbTe, quasibinary and quasiternary systems