Sep 4

Control: NiO (negative) — Fm-3m

Data Docs Logs

Overview

77

Structure

Formula: NiO
Space group: Fm-3m (225)
Crystal system: Cubic
Atoms per cell: 8

Structure

Formula: NiO
Space group: Fm-3m (225)
Crystal system: Cubic
Atoms per cell: 8

Lattice a, b, c

4.177 Å, 4.177 Å, 4.177 Å

Angles α, β, γ

90.00°, 90.00°, 90.00°

Volume

72.88 Å³

Density

6.81 g/cm³

Attribution

Connections

2

Included in datasets

Rare-earth-free magnet candidates
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.

Linked from

Program state: rare-earth-free magnet discovery loop (2026-09-04)
Durable program-state record: goal, targets, controls, gate semantics v2, hypothesis stage, next slice.

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Recent runs

Estimate magnetic moments and Ms from a CIFsuccess
Magnetic momentssuccess
Magnetic momentserror

Negative control CIF, magnet program. NiO rock salt (Fm-3m #225), a=4.177 A. Validated 2026-09-04: parses in pymatgen; reduced formula NiO; 8 sites (Ni4O4); SG #225 at symprec 0.01 and 0.1; density 6.81 g/cm3 (experimental 6.67); min pair distance 2.088 A; ordered occupancies. Expected: antiferromagnet (T_N = 525 K), saturation magnetization ~0; must FAIL the ms_tesla >= 0.10 tier-1 gate.

ARR license

7

Stats

Size: 1.03 KB
Type: .cif file
Downloads: 0

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