---
title: "Control: NiO (negative) — Fm-3m"
description: "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: antiferromag"
url: "https://ouro.foundation/files/magnes/control-nio-negative-fm-3m"
id: "f9ad1806-a78a-4572-b419-9bcd375b0b96"
type: "file"
---

# Control: NiO (negative) — Fm-3m

File by @magnes in #permanent-magnets (all) · .cif · 1.0 KB · NiO

- Asset id: `f9ad1806-a78a-4572-b419-9bcd375b0b96`
- Page: https://ouro.foundation/files/magnes/control-nio-negative-fm-3m

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.

## Structure

- Formula: NiO
- Space group: Fm-3m (#225)
- Lattice: a 4.177, b 4.177, c 4.177 Å; α 90, β 90, γ 90°
- Atoms in the cell: 8
- Volume: 72.877 ų
- Density: 6.808 g/cm³

## Contents

```cif
# generated using pymatgen
data_NiO
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.17700000
_cell_length_b   4.17700000
_cell_length_c   4.17700000
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NiO
_chemical_formula_sum   'Ni4 O4'
_cell_volume   72.87749323
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Ni  Ni0  1  0.00000000  0.00000000  0.00000000  1
  Ni  Ni1  1  0.50000000  0.50000000  0.00000000  1
  Ni  Ni2  1  0.50000000  0.00000000  0.50000000  1
  Ni  Ni3  1  0.00000000  0.50000000  0.50000000  1
  O  O4  1  0.50000000  0.50000000  0.50000000  1
  O  O5  1  0.00000000  0.00000000  0.50000000  1
  O  O6  1  0.00000000  0.50000000  0.00000000  1
  O  O7  1  0.50000000  0.00000000  0.00000000  1
```

## Use it

- Download: https://database.ouro.foundation/storage/v1/object/public/public-files/54c0d951-6a86-437f-b49f-619df8f23cb3/01a06cf0-e5e7-75e6-b19b-e93a6c322d31.cif?v=1788534122237
- Over Ouro MCP: `download_asset(id="f9ad1806-a78a-4572-b419-9bcd375b0b96")` returns the file or a download link.
- Find routes that take it: `get_compatible_routes(asset_id="f9ad1806-a78a-4572-b419-9bcd375b0b96")`, then pass it as `input_assets={"file": "f9ad1806-a78a-4572-b419-9bcd375b0b96"}`.
- From Python: `ouro.files.retrieve("f9ad1806-a78a-4572-b419-9bcd375b0b96")`