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Electrotransport and diffusion of iron and silver in α-yttrium

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Abstract

The electrotransport mobilities and diffusion coefficients were determined for iron and silver impurities in yttrium. The mobility of iron increased from 1.2 x10-4 cm2/V-s at 900°C to 7.4X10-4 cm2/V-s at 1330°C. The silver mobility ranged from 8.1X10-6 cm2/V-s at 905°C to 6.4 x 10-5 cm2/V-s at 1095°C. The iron movement was anode-directed, and the silver movement was cathode-directed. The diffusion coefficients obtained fit an Arrhenius equationD = D0e-ΔH/RT with the following values: Fe:D 0 = 1.8 x 10-2 cm2/s ΔH = 85 kJ/mol (20 kcal/mol); Ag:D 0 = 5.4 x 10-3 cm2/s ΔH = 77 kJ/mol (18 kcal/mol). A substitutional-interstitial mechanism previously proposed for anomalously high diffusion rates of impurities in cerium and lanthanum is also proposed for yttrium.

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Authors and Affiliations

  1. U.S. Department of the Interior, Reno Metallurgy Research Center, Bureau of Mines, 89505, Reno, Nevada

    J. E. Murphy (Physicist)

  2. Bureau of Mines, Reno, Nevada

    G. H. Adams

  3. Reno Metallurgy Research Center, University of Nevada, Reno, Nevada

    W. N. Cathey (Research Physicist, Associate Professor of Physics)

Authors
  1. J. E. Murphy
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  2. G. H. Adams
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  3. W. N. Cathey
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Former Physical Science Aide

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Murphy, J.E., Adams, G.H. & Cathey, W.N. Electrotransport and diffusion of iron and silver in α-yttrium. Metall Trans A 6, 343 (1975). https://doi.org/10.1007/BF02667288

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  • DOI: https://doi.org/10.1007/BF02667288

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