Abstract
The potential energy of an octahedral defect cluster in a bcc lattice has been examined by a lattice theory coupled with an eigenstrain method. By examining the energetics of the diffusional approach of an interstitial atom to an Fe 16N 2 precipitate, a high energy barrier was found before the nitrogen atom reached a stable site on the flat surface. On the other hand, the nitrogen atom which approaches from the edge side of the precipitate does not encounter such a barrier. This explains the experimental observation that Fe 16N 2 is formed as a thin plate without an increase in the thickness, even though a spherical cluster is calculated to be of lower energy.
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