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Thermodynamic properties of solid Au-Zn alloys by atomic absorption spectroscopy

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Abstract

Thermodynamic activities of zinc have been determined as functions of temperature from 600° to 830°K for a series of fourteen Au-Zn alloys within the β′ phase field about the AuZn composition. Data were obtained by measuring the attenuation of the resonant zinc line at 3076Å by zinc vapor in equilibrium with the alloy contained in an evacuated, sealed silica cell. A 300-fold zinc activity increase was observed in going from 40 to 54 at. pct Zn. Partial molar free energies, enthalpies, and entropies of zinc were calculated from the data. Experimental activities were used to deduce the nature of the point defects in the AuZn compound on both sides of stoichiometry. Gold substitutes on zinc sites when zinc is deficient, while zinc substitutes on normal gold sites when excess zinc is present. The intrinsic defect concentration at the AuZn composition was found to be about 0.2 pct at 700°K.

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Authors and Affiliations

  1. Ledgemont Laboratory, Kennecott Copper Corp., Lexington, Mass

    J. P. Pemsler (Staff Scientist) & E. J. Rapperport (Metallurgist)

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  1. J. P. Pemsler
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  2. E. J. Rapperport
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Pemsler, J.P., Rapperport, E.J. Thermodynamic properties of solid Au-Zn alloys by atomic absorption spectroscopy. Metall Trans 2, 79–84 (1971). https://doi.org/10.1007/BF02662640

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