Zr₆Fe₈Co₈Si₇C: Orb-relaxed cell (Fm-3m, ordered carbon-filled G phase)

Zr6Fe8Co8Si7C, Fm-3m, 30-atom primitive, a = 11.47 A: the Zr6Fe16Si7 G phase with Co on the 32f site that has four Si neighbours, Fe on the 32f site with three, and C in the empty Zr6 octahedron. Relaxed with Orb v3 on Ouro. On the Orb v3 hull, 6.4 meV/atom below the line between Zr6Fe16Si7C and Zr6Co16Si7C; 0 on the published-PBE surface; the reverse Fe/Co order is 22 meV/atom above the hull. Absent from MP, Alexandria, GNoME, COD. Sun-tetragonal loop 7; ML-only, no DFT or phonons yet.