Vaporization Chemistry and Thermodynamics of Solid Solutions in the Cadmium‐Indium‐Sulfide, Indium‐Sulfide System

Vaporization chemistry in the system was studied by simultaneous Knudsen‐effusion and torsion‐effusion measurements of the vapor pressure. The vapor was assumed to be a mixture of the vapors of and , the latter being suppressed by the more volatile . Solid compositions were deduced from Debye‐Scherrer x‐ray diffractograms and from the mass loss of a sample with known initial composition. Vapor pressures were measured over pure and over solid solutions of in between compositions corresponding to and . The solutions were ideal with mol fractions calculated on the basis of formulas and . Third‐law analysis gave of vaporization of pure , , and of from solid solution in , . The of solution of in was . The substance is an ideal, nearly saturated solid solution of in . The present study gave no indication of a high temperature phase change in .