| The liquid aluminum-zinc and-tellurium systems have been investigated by dew point method for clarifying their thermodynamic properties. In this work, the dew point method has been improved so as to find out the dew point thermoanalytically and record it automatically. Consequently the measuring operation is simpler, and that the result is more accurate than that of ordinary one. The measurements were carried over entire composition range for both systems, and in the temperature range 650° to 800℃ for the Al-Zn system and 770℃ to 920℃ for Al-Te system. The activities of the components Al, Zn and Te of both systems have been derived using the measured data, and also calculated from quasi-chemical approach, regular solution theory and the heat of fusion of Al₂Te₃. The values derived in various ways agree well one another. The interaction energies and shortrange order parameters for the Al-Zn system have been calculated from quasichemical approach and it has been found that the results are reasonable to compare with the classical thermodynamic properties. |
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