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Solubility and thermodynamic properties of oxygen in solid molybdenum

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Abstract

The solubility of oxygen in solid Mo, determined in the range 1400 to 1900°C by equilibrating rods of zone-refined Mo with mixtures of Mo and MoO2 powders, can be expressed as ln ΧO α(sat) (atom fraction) = 5.86 - 27,900/T Using the known value of the free energy of formation of MoO2, the chemical potential of oxygen in the dilute solid solution is calculated to be μα O1/2μo O2 = ΔG α O = -10,760 + (6.92 +R ln χμ O)T ± 1000 cal/g-atom oxygen The heat of solution of oxygen in Solid Mo, ΔHOα = -10,760 ± 3000 cal/g-atom oxygen, and the excess entropy for the interstitial solid solution ΔSOα(xs, i) =- 9.10 ± 1.5 cal/degree, g-atom oxygen, assuming that the oxygen atoms reside in the octahedral interstices of bcc Mo.

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Authors and Affiliations

  1. Semi-Metals, Inc., Westbury, L. I., N.Y.

    S. C. Srivastava

  2. Department of Material Science, State University of N. Y., 11790, Stony Brook, NY

    L. L. Seigle (Professor)

Authors
  1. S. C. Srivastava
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  2. L. L. Seigle
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Srivastava, S.C., Seigle, L.L. Solubility and thermodynamic properties of oxygen in solid molybdenum. Metall Trans 5, 49–52 (1974). https://doi.org/10.1007/BF02642925

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