Temperature dependences of the saturated vapor pressure of elemental zinc (873-1234 K) and selenium (730-1063 K), as well as zinc selenide (673-1373 K), are investigated using the gravimetric method. Analysis of the experimental data demonstrates that these dependences can be adequately described by equations of the form log P = -A / T + B . The saturated vapor pressures calculated for zinc from the data obtained with the developed gravimetric method are in good agreement with those available in the literature.

The temperature dependences of the saturated vapor pressure of selenium (700-1100 K) and indium sesquiselenide In 0.4 Se 0.6 (1123-1373 K) are investigated using the gravimetric method. The saturated vapor pressures obtained in this study for selenium and the In 0.4 Se 0.6 compound are in satisfactory agreement with the data available in the literature. The enthalpy of vaporization of In 0.4 Se 0.6 is estimated.

Polycrystalline alloys in the Cu-In-Se ternary system of specified compositions are synthesized using an original silica apparatus designed by the authors and the temperature-time conditions also specially chosen for this synthesis. The region of existence of CuInSe 2 -based solid solutions in the Cu-In-Se system, the temperature of the polymorphic transformation of the CuInSe 2 compound from the chalcopyrite modification into the sphalerite modification, and the melting temperature of the sphalerite modification are determined experimentally.

The saturated vapor pressure of the Cu 2 Se and CuInSe 2 compounds is investigated using the gravimetric method in the temperature ranges 1282-1450 and 1173-1423 K, respectively. It is demonstrated that, in the case of congruent vaporization, the temperature dependences of the saturated vapor pressure of the Cu 2 Se and CuInSe 2 compounds in the temperature ranges under investigation are adequately described by the equation log P = -A / T + B . The enthalpy and entropy of vaporization are estimated for both compounds.