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A thermodynamic investigation of the Ag-Mn system

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Abstract

A thermodynamic study has been made of the Ag-Mn system in the temperature range of 1100° to 1200°K, using a modified Knudsen effusion technique. The activities of silver and manganese were determined by analysis of the vapor phase using X-ray fluorescence and appropriate graphical integration of the composition function relating activity and vapor phase composition. Silver-rich solutions, in the single-phase region, were found to exhibit exothermic heats of mixing and negative deviations from ideality for the activity of the solvent and both negative and positive deviations from Raoult’s law for the activity of the solute. Manganese-rich solutions, in the two-phase region, exhibit endothermic heats of mixing and positive deviations from ideality for the activities of both the solute and solvent. The negative excess entropies of mixing in the dilute manganese region are attributed to magnetic and electronic changes which occur at 20 at. pct Mn. These changes in magnetic and electronic properties are a result of a gradual change in the Mn-Mn interatomic separation and electronic structure. With increasing manganese content beyond 20 at. pct Mn, the excess entropies become positive, passing through a maximum as the two-phase boundary is reached. The positive excess entropies of mixing are attributed to lattice distortion resulting from size differences between silver and manganese atoms.

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Authors and Affiliations

  1. Sandia Corp., Livermore, Ca.

    R. W. Krenzer (Member of the Technical Staff)

  2. Department of Materials Science and Metallurgical Engineering, University of Cincinnati, Cincininnati, Ohio

    M. J. Pool (Associate Professor)

Authors
  1. R. W. Krenzer
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  2. M. J. Pool
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Additional information

This paper is based in part on a thesis submitted by R. W. Krenzer to the College of Engineering, University of Denver, Denver, Colo, in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

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Krenzer, R.W., Pool, M.J. A thermodynamic investigation of the Ag-Mn system. Metall Trans 2, 1029–1040 (1971). https://doi.org/10.1007/BF02664234

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  • DOI: https://doi.org/10.1007/BF02664234

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