<報文>起電力および分配平衡の測定によるAl-Au系二元合金の熱力学的研究

概要

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Thermodynamic properties of the liquid aluminum-gold system have been studied using the electromotive force method and the distribution method. The values of electromotive force for the following reversible galvanic cell have been determined in the temperature range 700° to 980℃. Al(l)|KCl+NaCl, AlCl_3|Al-Au(l). In the Al-Au system, an intermetallic compound AuAl_2 having a melting point of 1060℃ is formed. For the composition range near this compound, measurements were done by the distribution method at 1100℃, because the emf measurement cannot be used at high temperature. The derived activities of aluminum and gold exhibit large negative deviations from Raoult's law, the activity coefficients determined at infinite dilution being 0.00013 and 0.0025 at 1100℃ for aluminum and gold, respectively. The activities of the two components have also been calculated from the heats of fusion of two intermetallic compounds, AuAl_2 and Au_2Al, the values being in reasonable agreement with measured ones. The activity coefficients for this liquid solution have been determined as follows : RT lnγ_<Al>=-8170(1-N_<Al>)^2-16330(1-N_<Al>)^3 RT lnγ_<Au>=-32660(1-N_<Au>)^2+16330(1-N_<Au>)^3 Other various thermodynamic quantities have also been derived and discussed.
東北大学の論文
1969-10-30