The Al-Co alloy system contains a phase AI3CO of unknown structure. Recently Ma and Kuo determined its space group as Pnmn with lattice constants a = 12·5 Å, b = 8·1 Å and c = 14·6 Å. We propose a structural model for the orthorhombic phase of AI3CO including explicit atomic positions and occupancy factors. This model relates to the monoclinic phase of AI13CO4by periodic twinning. Our model displays mechanical and thermodynamic stability as determined using approximate pair potentials developed for the Al-Co alloys.
|Number of pages
|Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
|Published - Mar 1995