Abstract

The growth of cadmium crystals from the vapor has been studied as a function of vapor saturation and growth temperature. The temperature of growth was varied from 240°C to 300°C, and the saturation ratio, defined as the actual partial pressure of vapor at the crystal over the equilibrium vapor pressure of cadmium at the growth temperature, was varied from 2 to 30 at each growth temperature. The morphology of the crystal growth was observed to change from whiskers at low saturation ratios to platelets at higher saturation ratios. The temperature dependence of the critical saturation ratio was found to conform to the temperature dependence of two-dimensional nucleation on the crystal, as presented by Hirth and Pound).

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