domingo, 25 de julio de 2010

Other point defects: self-interstitials, impurities

Schematic representationof different point defects:

  • vacancy(1);
  • self-interstitial(2);
  • interstitial impurity(3);
  • substitutional impurities(4,5)
The arrows show the local stresses introduced by the point defects.

Self-interstitials in metals introduce large distortions in thesurrounding lattice ⇒ the energy of self-interstitial
formation is ~ 3 times larger as compared to vacancies (Qi ~ 3×Qv) ⇒ equilibrium concentration of self-interstitials is very low (less than one self-interstitial per cm3 at room T).

CI 18694836

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