Zr₆Fe₁₂Si₄C, PBE-relaxed (U₆Co₁₂Ge₄C type, Im-3m)

New cubic carbide, 23-atom primitive cell relaxed in PBE (ABACUS, TZDP, k-spacing 0.2, forces < 0.04 eV/Å). 5.7 meV/atom below the hull of our computed competitors (filled G phase Zr₆Fe₁₆Si₇C, ZrFe₂, Zr₂Fe₃Si, ZrC); no imaginary phonon modes. Relaxed from the Orb geometry in this file's family. Sun-tetragonal campaign, loop 5.