Abstract
One of the most unexpected and surprising predictions of a recently proposed interstitialcy model for condensed matter states is that the self-interstitial concentration just below the melting point should be only an order of magnitude below the vacancy concentration. This prediction can be tested using existing lattice parameter measurements if a suitable method of estimating the defect-free crystal expansion is found. We have developed such a test and deduce an interstitial concentration of 7 × 10 −4 near the triple point of krypton. This value is a striking confirmation of one of the boldest predictions of the interstitialcy model of condensed matter states. For copper, silver, gold and aluminum, where the defect density is smaller, less certain but positive evidence for interstitials in thermal equilibrium is also obtained.
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