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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