Self-interstitials structures determined

Structures of self-interstitials can be determined by measuring the X-ray Huang scattering (see Section 2.2). To our knowledge, three ordered alloys have been studied by this technique the LI2 compounds NijFe (Bender and Ehrhart, 1982), and CujAu (Urban and Ehrhart, 1987) and the B2 structure Fe-40Vo Al (Beaufort et al., 1986). 

The diffusion coefficient for a given ion in a crystal is determined, as we have seen, by the atomistic properties of the ion in the structural sites where the vacancy (or interstitial) participating in the migration process is created (see eq. 4.71). The units of diffusion (and/or self-diffusion ) are usually cm sec . Pick s first law relates the diffusion of a given ion A (Jf) to the concentration gradient along a given direction X ... 

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