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The formation of cuprous sulphide on single crystals of cadmium sulphide

The rate at which a layer of cuprous sulphide is formed on single crystals of cadmium sulphide immersed in an aqueous solution containing cuprous ions has been monitored. Crystals doped with indium, gallium or copper have been studied. The growth of cuprous sulphide on crystals containing indium or gallium is governed by two parabolic laws, whereas a single parabolic law can be used to describe the rate of growth on copper-doped crystals.