B4Fe11W5 P4/m tetragonal CIF (H4 Fe-W-B candidate)

Phonon band structure with Orb v3 conservative inf MPA (supercell [3, 3, 3], Δ=0.01 Å); imaginary modes detected; min freq = -12.03 THz

Single source of truth for the rare-earth-free permanent magnet discovery program (quest 01a06c81). One row per (candidate, attempt). Schema follows skills/discovery-loop.md: property columns carry values only with action receipts in actionids; stage/status enums gate tier-2 spend; ciffileid is a file-asset reference. Excluded elements: La through Lu, Sc, Y. Row hypothesisid='schema-v1' is a schema probe, not a candidate.

H4 Fe-W-B verdict: REFUTED. The constrained ternary window is empty and the two uniaxial near-hull ternary phases are dynamically unstable. Boron does not stabilize the Fe-W anisotropy carrier.