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The binary alloys were described by supercells consisting of 2 * 2 * 2 elementary cubic or hexagonal unit cells with a total of 16 atoms. A large variety of alloy compositions were studied by systematically replacing Ti atoms by either Nb atoms. The lowest alloy composition was 6.25 at.% (one Nb atom in a 16 atom supercell). For each alloy composition various local arrangements were considered, and in total 48 body-centered cubic (bcc) and 28 hexagonal closed-packed (hcp) configurations were studied.

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the number comes from the different sublattice arrangements to check for short range order effects

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