Parameters of growth by the flow method of ZnS crystals

Plate crystals of zinc sulphide were grown from the vapour phase in argon flow. The temperature gradient in the growth zone and the flow rate were studied as growth parameters at a constant charge temperature of 1350°C. The yield of the plate crystals was found to increase at low temperature gradients. Plates of up to 1 cm 2 area and from 0·1 to 0·3 mm thickness were grown at a gradient of 15 degC cm -1 and with a flow rate of 1·21. min -1 . A relationship between temperature gradient and crystal habit has been found. It is shown that dissipation of the heat of condensation influences the crystal habit.