The Fe2P structure with boron on the 1b site and phosphorus on 2c. The same cell is in Alexandria (agm041963190, CC-BY-4.0); this copy was rebuilt and relaxed with PBE (ABACUS, DZP, k-spacing 0.2) on Ouro. K1 +1.46 MJ/m3 with the easy axis along c, 1.41 T. 66 meV/atom above the Orb hull against Fe2B + Fe2P: not a stable compound.