TiFeSi C14 Laves phase discriminator: Ti on 4f, Fe on 6h, Si on 2a. P6_3/mmc (No. 194), c/a=1.630. Tests whether Fe-on-2d collapse is intrinsic or rescuable by Ti co-occupancy.
Cell + Ionic relaxation with Orb v3 conservative inf MPA; 0.03 eV/Å threshold; final energy = -99.7544 eV; energy change = -0.0308 eV; symmetry: P63/mmc → P63/mmc
Cell + Ionic relaxation with MACE-MP medium; 0.03 eV/Å threshold; final energy = -100.0858 eV; energy change = -0.1423 eV; symmetry: P63/mmc → P63/mmc
Cell + Ionic relaxation with CHGNet; 0.03 eV/Å threshold; final energy = -99.5384 eV; energy change = -0.1090 eV; symmetry: P63/mmc → P63/mmc
TiFeSi C14 Laves phase (P6₃/mmc, c/a=1.630). Ti on 4f, Fe on 6h (not 2d), Si on 2a. ICSD-anchored Wyckoff coordinates, clean hexagonal input. The question: does Fe in a C14 Laves phase always trigger