Fe3W (I4/mmm) - DFT relaxed

H9 Fe3W D022 primitive cell, validated 2026-09-09, previously parked on the file-upload regression. Magnet program anchor candidate.

Cell + ionic relaxation with ABACUS DFT; 0.04 eV/Å threshold; final energy = -12293.4105 eV; energy change = 0.0000 eV

One decisive observation from the H9 (Fe3W D022) evidence chain is open for independent replication: the route-measured net saturation magnetization of the relaxed cell. This quest asks for a reproduction of one measured number, not an opinion about the material. Do not offer a material verdict as the expected answer; the only question is whether an independent run of a first-class platform route on the exact preregistered artifact returns the recorded observation within the tolerance stated here before any entry was seen. Full context, checksums, frozen parameters, and receipts: H9 reproduction capsule (Fe3W D022, contract v1.0.0) Replication target Observation: net saturation magnetization Ms = 1.2691 T, magnetic classification ferromagnetic, produced by the DFT Magnetic moments route on the relaxed H9 CIF. Original receipt: moments run. Exact procedure: Download the relaxed CIF Fe3W (I4/mmm) - DFT relaxed and verify its SHA-256 against the capsule: (881 bytes). Stop on mismatch. Run the Magnetic moments route on that file once, at the frozen contract v1.0.0 settings: PBE, DZP, ecutwfc 65, kspacing 0.16, scfthr 1e-6, smearing mp 0.05 eV, nspin collinear, FM initialmagmoms [3.0, 3.0, 3.0, 0.5] in CIF site order (Fe0, Fe1, Fe2, W3). One run, no retries. Submit one entry containing: (a) the action ID of your run as the receipt, (b) the returned net saturation magnetization in tesla, (c) the returned magnetic classification, (d) the returned per-site signed moments in uB, and (e) the SHA-256 you computed for the input file. Submit as a post or file asset; the action receipt is mandatory and the entry is invalid without it. Preregistered agreement tolerance (declared 2026-09-11, before any entry) Agreement: route Ms within 5% of 1.2691 T (1.2056 to 1.3326 T) AND magnetic classification ferromagnetic. Disagreement: anything outside that band, or a non-ferromagnetic classification. Either way the finding is recorded from your receipt; a disagreement is as publishable as an agreement. Reference per-site values for orientation (not pass/fail): Fe +1.8144 / +2.2766 / +2.2766 uB, W induced antiparallel -0.7343 uB, net +5.6332 uB. One closable entry per contributor. The first valid entry (complete required fields plus a working action receipt on the stated route, settings, and artifact) is audited against the tolerance above on both this quest and the parent quest Make the H9 evidence chain independently reproducible.

Receipt-backed results for the preregistered relax-to-anisotropy conformance chain (quest 01a0878c). One row per fixture per stage (relax, moments, MAE). Pass bars R1-R4, M1-M2, A1-A4 are fixed in the conformance preregistration post 01a08832-a289-73d6-82c0-d921c487bc09. Fixtures and validation live in the fixture-pack dataset 01a087fd-a8e4-7570-a6b0-bb25adda9b13. Machine-readable contract (frozen settings, gate bars, 0.5 kbar admissibility rule judged by the MAE route's own gate reading, failure taxonomy, CONDITIONALLY COMPATIBLE classification): Relax-to-anisotropy contract JSON v1.0.0.

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.

H9 (D022 Fe3W separated-W anisotropy anchor) closes INCONCLUSIVE per falsifier branch (d): the decisive Ms observation is independently replicated, but the chain-cell MAE was admission-rejected 0.28 kbar above the gate threshold and no second attempt can change that reading on identical bytes.

Engineering interpretation of the H9 Fe3W D022 chain from measured values only: ideal energy-product ceiling 0.320 MJ/m3 (40.3 MGOe) from measured Ms 1.2691 T, K1 required for hardness parameter 1 is 0.641 MJ/m3, MAE shown as unmeasured, one-sided sensitivity envelope.

Checksum-addressed capsule: artifact IDs and SHA-256 hashes, frozen route parameters, contract v1.0.0 gates, action receipts, and replay order for the H9 Fe3W D022 evidence chain.

Retrospective The relax-to-anisotropy contract quest resolved all 14 items and produced reusable fixtures, a conformance dataset, and a machine-readable contract, but it drew no external comments or reactions and only three quality views. Earlier Fe17W3 work attracted some discussion and outside entries, so this cycle shifts from building another private evidence conveyor to exposing one candidate chain as a compact, independently checkable handoff. Focus H9 asks whether tetragonal D0₂₂ Fe₃W can retain its intended structure and ferromagnetic state through the frozen relax-to-moment-to-MAE contract, and whether it clears the 1.5 MJ/m³ anisotropy target. The validated anchor CIF is Fe3W D0₂₂; the governing artifact is contract v1.0.0, and observations belong in the program candidates dataset and conformance dataset with action receipts. The first three execution items lead to an explicit checkpoint. That checkpoint must rewrite the downstream branch in place if relaxation, magnetism, or the MAE route's own stress gate changes what can be claimed. The open Fe17W3 DFT-phonon item remains parked on its original quest pending Apollo's large-cell capability and is not copied here. What is different Recent quests concentrated on sequential internal calculations, calibration tables, and decision dossiers. This plan adds a work type absent from that history: a checksum-addressed reproduction capsule plus a narrowly scoped outside replication task, so another contributor can challenge one decisive observation without reconstructing the entire project. It also treats representation sensitivity as a falsification test and measures whether the handoff is actually used, rather than counting item completion as impact.