Abstract
A calorimetric study of alloy formation in Au-Cu and Au-In systems was carried out. The heats of mixing, ΔH mix, were measured at 1380,1484 and 1604 K for Au-Cu and at 1387, 1449 and 1505 K for Au-In in the full concentration range. The results of experiments were described by approximating equations. Observed values of ΔH mix were discussed using the phase diagrams of the systems. It was shown that the systems become closer to the ideal state with increasing temperature. From the experimental data, the dependencies of the enthalpies of the systems on the composition and temperature were estimated. The simultaneous effects of composition and temperature on enthalpy are represented in 3D diagrams. The specific heats of the alloys, in the temperature range of experiments, were derived from the slopes of enthalpy planes.
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References
L. Topor and O. J. Kleppa, Metallurgical Transactions A, 15A (1984) 203.
A. Neckel and S. Wagner, Berichte der Bunsengesellschaft, 73 (1969) 210.
R. A. Oriani, Acta Metallurgica, 4 (1956) 15.
R. K. Edwards and M. B. Brodsky, J. Am. Chem. Soc., 78 (1956) 2983.
J. P. Hager, S. M. Howard and J. H. Jones, Metallurgical Transactions, 1 (1970) 415.
R. Hultgren, P. S. Desai, D. T. Hawkins, K. K. Kelley and D. D. Wagman, Selected Values of the Thermodynamic Properties of the Elements, ASM. Metals Park, Ohio 1973.
O. J. Kleppa, J. Phys. Chem., 60 (1956) 858.
M. Hansen and K. Anderko, Structures of Binary Alloys, V. 1, Metallurgizdat, Moscow 1962 (in Russian).
J. P. Pool, B. Predel and E. Schultheiss, Thermochim. Acta, 28 (1979) 349.
O. Kubaschewski and C. B. Alcock, Metallurgical Thermochemistry, Metallurgia, Moscow 1982 (in Russian).
U. D. Veryatin, V. P. Mashirev, N. G. Ryabtsev, V. I. Tarasov, B. D. Rogozkin and I. V. Korobov, Thermodynamic Properties of Inorganic Materials. Reference Book, Atomizdat, Moscow 1965 (in Russian).
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Bykov, A., Pastukhov, E. A Calorimetric Study of Alloy Formation in Au-Cu and Au-In Systems. Journal of Thermal Analysis and Calorimetry 60, 845–850 (2000). https://doi.org/10.1023/A:1010151506776
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DOI: https://doi.org/10.1023/A:1010151506776