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Oxidation of iridium

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Abstract

Iridium wires self-reistance-heated to temperatures in the range of 1675 to 2260°C (1948 to 2533 K) were oxidized in naturally convected oxygen at pressures in the range of 0.00132 to 1.32 atmospheres (134 to 1.34× 105 Pa). The experimental results were closely corre-lated by a theoretical rate equation based upon control of the oxidation rates by diffusion of Ir(g), IrO2(g) and IrO3(g) through the gaseous boundary layer. Values were obtained for the standard-state free-energies of formation of IrO2(g) and IrO3(g), and their temperature dependencies were described by empirical equations.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Montana State University, 59715, Bozeman, Mont.

    R. Ted Wimber (Professor) & Hal G. Kraus (Graduate Re-search Assistant)

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  1. R. Ted Wimber
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  2. Hal G. Kraus
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Wimber, R.T., Kraus, H.G. Oxidation of iridium. Metall Trans 5, 1565–1571 (1974). https://doi.org/10.1007/BF02646327

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