Abstract
Abstract The effect of isotope mass on the behavior of the O-H defect in niobium was studied using internal friction techniques. Large, non-classical isotope effects were found for the jump frequencies, motion activation enthalpies, and binding enthalpies for the 〈100〉 tetragonal O-H and O-D defects. The theories of light element interstitial diffusion are not able to satisfactorily account for the observed effects.
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