溶融銅-テルル, 銅-セレン系合金の活量測定

Abstract

By using the transportation method, the vapour pressures of Te and Se have been measured for liquid Cu-Te and Cu-Se alloys containing 65 to 100 at% copper, mainly at copper smelting temperature.The activities of Te and Se in these alloys calculated from the vapour pressures were found to exhibit considerable negative deviations from Raoult's law, and the deviation of ase was larger than that of Te.The values of γ°Te for the Cu-Te system are 3.28×10-2 at 1, 200°C, 2.92×10-2 at 1, 150°C. On the other hand, for the Cu-Se system, the value of γ°Se is not determined precisely as in the case of Cu-Te system because of the experimental difficulty associated with the measurements at low selenium concentration, but it is estimated to be 2.0×10-3 at 1, 200°C. These values suggest that the removal of Te and Se from liquid copper is not so easy as compared with the others.For the binary alloys between copper and elements belong to the fifth period, the activity curves of these elements in copper rich side show a trend to increase negative deviation from Raoult's law, going to right in the same period.