By Richard J. Borg and G. J. Dienes (Auth.)
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Extra resources for An Introduction to Solid State Diffusion
Within the recombination volume (by definition) the attractive force is sufficiently strong so that annihilation of the interstitial takes place without the need of thermal activation. This athermal recombination mechanism is prominent in the elimination of defects induced by radiation damage because a significant fraction of the total interstitial-vacancy pairs remains within the recombination volume. 1) their migration en thalpies àH are very much smaller than for the diffusion of vacancies.
3. The experimental vacancy parameters for gold are: Δ / / ° = 21620 c a l / m o l e AS = 1 Κ ΔΕ Β = 3450 c a l / m o l e = divacancy binding energy Calculate the monovacancy, u and divacancy, v , concentrations and the v /v ratios at the melting point, 1063°C, and at 1/2 T . v 2 1 2 m 52 II Point Defects in Elemental Crystalline Substances 4. 25 eV (typical of silver as an impurity). Assume AS = 0. 57 for X? = 10 ~ at Τ = 668 Κ and Τ = 1136 Κ. Discuss the results. 0 6 5. e. 7). 6. 10(f) at T .
The discrepancy between these two types of measurements provides the main support for the interstitialcy theory. C. Crowdion Mechanism T h e sharing of a single lattice site by two atoms, as in the case of split interstitials, is carried to the extreme by the crowdion configuration where « 4 - 1 atoms occupy η lattice sites. (See Fig. ) There are n o surely proven cases of a crowdion configuration existing in thermal equilibrium in a well annealed crystal, but it may exist as the result of radiation damage.