Abstract
Powers and Doyle proposed the existence of pairs of oxygen atoms in interstitial solid solutions of tantalum, based on internal friction measurements from which an asymmetrical broadening of the observed Snoek peak was derived. The present experiments on high-purity tantalum doped only with oxygen in different concentrations show clearly that the oxygen Snoek peak is highly symmetrical for all investigated oxygen contents (up to 5900 at.ppm). The peak is somewhat broadened and shifted to slightly higher temperatures for the higher oxygen contents. Powers' experimental data are carefully reanalyzed and the asymmetry of the Snoek peak cannot be confirmed. It appears thus that the existence of oxygen pairs in tantalum-oxygen solid solutions proposed by Powers is questionable. It has been found that the broadened Snoek peak for the higher oxygen contents can be described by a continuous distribution of relaxation times. Possible physical models to account for the symmetrical broadening and the shift of the Snoek peak are discussed.
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