Phase diagram of samarium Monochalcogenides

Abstract

By using a simple ionic model for the cohesive energy and electronic terms similar to those of the Falicov—Kimball model for metal—insulator transitions we obtain a phase diagram for SmS with a critical point at Tk = 554°K. The model reduces to the thermodynamic theory proposed by Aptekar and Ponyatovskiy and allows to calculate the p —V isotherms for SmS, SmSe and SmTe, and the concentration of holes in the 4/shell as functions of pressure and temperature.