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Factors influencing the formation of silver-rich solid solutions in rare-earth-silver alloy systems

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Abstract

The solid solubilities of all of the naturally occurring rare-earth metals in silver have been determined by using the X-ray parametric method. The solubilities range from 0.01 to 0.02 at. pct for Eu to 10.5 at. pct for Sc. The stoichiometries of the silver-rich compounds and some of their crystal structures were determined. The silver-rich compounds found in this study are: RAg5(La, Ce, Pr, Eu, and Yb), RAg4(Lu and Sc), R14Ag5l(La to Sm, Gd to Er, Yb, and Y) and TmAg3. The silver/silver-rich compound eutectic temperatures were also determined. Analysis of these data indicates that several factors in addition to the Hume-Rothery criteria influence the formation and extent of solid solutions. These include the mutual adjustment of size and electronegativity of the solvent and solute if the pure metal size differences are less than a critical value of 22 to 25 pct, the composition of the first solvent-rich compound, and the lattice rigidity of the solvent.

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Authors and Affiliations

  1. Department of Metallurgy and Senior Metallurgist, Institute for Atomic Research, Iowa State University, Ames, Iowa

    K. A. Gschneidner (Professor)

  2. Institute of Atomic Research, USA

    O. D. McMasters (Assistant Metallurgist) & D. G. Alexander (Junior Metallurgist)

Authors
  1. K. A. Gschneidner
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  2. O. D. McMasters
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  3. D. G. Alexander
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  4. R. F. Venteicher
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Formerly Research Helper, Institute for Atomic Research, is in the U.S. Armed Forces.

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Gschneidner, K.A., McMasters, O.D., Alexander, D.G. et al. Factors influencing the formation of silver-rich solid solutions in rare-earth-silver alloy systems. Metall Trans 1, 1961–1971 (1970). https://doi.org/10.1007/BF02642796

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  • DOI: https://doi.org/10.1007/BF02642796

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