Abstract
The average surface free energy of solid molybdenum has been measured using the Udin zero creep method at 2500 °C under 1 atm of tantalum-gettered argon. Strains were measured at the creep temperature. Surface energy values agree with previous work in which strains were measured at room temperature. The most probable value is 1900 ergs/cm 2 which is about 15% lower than the liquid surface tension. Residual impurity adsorption is believed to be the cause of the low value. Volume diffusion coefficients determined from the Herring-Nabarro creep rate equation agree with the published radioactive tracer results within a factor of 2.
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