Abstract
Vapor pressures of selenium in cobalt-selenium alloys were determined by an isopiestic method between 600 and 1000 °C and between 52 and 66.6 at % Se. Activities of selenium were evaluated according to three methods taking into account the complexity of the selenium vapor. For the nonstoichiometric Co1−xSe phase with NiAs-type structure a statistical model was applied. Activities and partial molar enthalpies of selenium derived by assuming random distribution of cobalt atoms and cobalt vacancies in the 001/2-layers of the NiAs-lattice are in very good agreement with the experimental values. The interaction energy between cobalt vacancies was found to be 7780 cal/g-atom.
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