On the Ordered Arrangement of Interstitial Atoms in Interstitial Solid Solution. II. The Configuration of Interstitial Solute Atoms in Face Centered Cubic Lattice

Abstract

Continuing the previous report, the distribution problem of interstitial solute atoms in face centered cubic lattice was treated. As the interaction energy between the interstitial atoms is smaller in this case than in the former case and the symmetry does not change due to the ordered arrangement of them, this case is phenomenologically not so interesting as former. The general characteristics of the distribution of solute atoms are considered to be quite analogous to the superlattice problem of binary substitutional alloys with face centered cubic lattice. Judging from the magnitude of the interaction energy, the distribution of C atoms in Austenite of Fe-C system would be at random. In Fe-N system, on the other hand, the superlattice Fe₄N has been observed, which is interesting because it is ferromagnetic despite of the fact that it has face centered cubic lattice.