Films of the solid solution system have been produced by simultaneous evaporation from two separately controlled sources onto a single substrate. Films of uniform composition were made covering the full range from 0 to 100% concentration, and the dependence of energy gap, crystal habit, and lattice parameter on composition was investigated. Optical transmission edge measurements yielded a nearly linear dependence of gap width on composition between the values of 2.35 ev for pure cadmium sulfide and 3.35 ev for pure zinc sulfide. X‐ray diffraction specimens were prepared by scraping the films from the substrates. The powder patterns obtained showed that a gradual transition from the wurtzite structure typical of CdS to the characteristic zinc‐blende form takes place between 60 and 85% concentration. At compositions where both modifications are present, the basal plane spacing is the same for the hexagonal (002) and cubic (111). Equivalent hexagonal lattice parameters could therefore be defined for the cubic form, and a and c calculated for all compositions. The results show good agreement with data obtained by others on bulk material.
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Kane et al. (1966) studied this question.