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Internal Oxidation of a Ag-l.3 at.% Se Alloy. Part I: Composition and Appearance of Oxidation Products

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Abstract

The internal oxidation of a two-phase Ag-1.3 at.% Se alloy in pure oxygen was studied at 750, 800 and 830°C. The alloy is composed of a dilute solid solution of selenium in silver) and Ag2Se intermetallic particles. The internal oxidation of this alloy proceeds through gradual in-situ oxidation of the Ag2Se particles as well as through diffusive internal oxidation of selenium from solid solution. Gradual in-situ internal oxidation of Ag2Se particles reflects itself in the appearance of two internal-oxidation fronts, inner and outer, marking the beginning and end of the in-situ oxidation of Ag2Se particles. The oxide phase formed during in-situ oxidation is the molten double oxide, Ag2SeO3. A theoretical treatment of the phase relationships in a hypothetical Ag–Ag2Se–Ag2SeO3 ternary phase diagram is presented to assist the explanation of the mechanism of in-situ oxidation. The kinetics of oxidation are presented in Part II.

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Authors and Affiliations

  1. Department of Materials and Metallurgy, Faculty of Natural Sciences and Engineering, University of Ljubljana, Slovenia

    J. Roth, L. Kosec, P. Škraba, M. Bizjak & J. Medved

  2. Department of Geology, Faculty of Natural Sciences and Engineering, University of Ljubljana, Slovenia

    M. Dobnikar

  3. Faculty of Mechanical Engineering, University of Maribor, Slovenia

    I. Anžel

Authors
  1. J. Roth
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  2. L. Kosec
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  3. P. Škraba
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  4. M. Bizjak
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  5. J. Medved
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  6. M. Dobnikar
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  7. I. Anžel
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Roth, J., Kosec, L., Škraba, P. et al. Internal Oxidation of a Ag-l.3 at.% Se Alloy. Part I: Composition and Appearance of Oxidation Products. Oxidation of Metals 62, 273–291 (2004). https://doi.org/10.1007/s11085-004-7811-y

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  • DOI: https://doi.org/10.1007/s11085-004-7811-y

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