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Direct Activity Measurements in Liquid Ag-Au-Ge System and Its Solution Model Development by Computational Techniques

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Abstract

Ag activities in the Ag-Au-Ge solution were determined by the mass spectrometric analysis of effusates from a unique valved Knudsen cell at 1416 K. A mathematical model was established for Ag activity coefficient as a function of alloy composition. Activities of Au and Ge were calculated by numerical ternary Gibbs-Duhem integration on a spreadsheet. The data obtained from this investigation show that the activities on all three binary systems occurring in the ternary system are in good agreement with accepted literature values. The behavior of all pseudo binaries was found to be consistent with Darken’s quadratic formalism. Darken surface of Ag is shown.

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Acknowledgments

The authors gratefully acknowledge the National Science Foundation and the State of South Dakota for funding the equipment at SDSMT. One of the author, Qiling Yu, wishes to express his great appreciation to South Dakota Mining and Mineral Resources and Research Institute for the support under fellowship grants during this investigation.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Arizona Materials Laboratory, The University of Arizona, 4715 E. Ft. Lowell Rd., Tucson, AZ, 85712, USA

    Qiling Yu

  2. Department of Metallurgical Engineering, South Dakota School of Mines and Technology, 501 E. St. Joseph St., Rapid City, SD, 57701, USA

    Stanley M. Howard

Authors
  1. Qiling Yu
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  2. Stanley M. Howard
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Yu, Q., Howard, S.M. Direct Activity Measurements in Liquid Ag-Au-Ge System and Its Solution Model Development by Computational Techniques. MRS Online Proceedings Library 291, 425–430 (1992). https://doi.org/10.1557/PROC-291-425

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