Abstract
The surface tension and contact angle of molten GaAs were measured by the sessile drop technique. The dependence of surface tension and contact angle on temperature and on the deviations from stoichiometry was determined. A computer program was used to calculate the properties from the sessile drop profile. The wetting behavior of the melt was studied on the following surfaces: quartz, sandblasted quartz, carbon-coated quartz and pyrolytic boron nitride. The surface tension of molten GaAs decreased with increasing temperature, and decreased slightly with excess As. The degree of wetting increased in the following order: pyrolytic boron nitride, sandblasted quartz, carbon-coated quartz and plain quartz. The contact angle decreased with increasing temperature and seemed to decrease slightly with increasing As.
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