---
title: "bcc Fe conventional 2-atom cell (gate0-verify two-seed known-answer control)"
description: "Known-answer control for the gate0-verify two-seed ordering envelope: conventional 2-atom bcc Fe (a=2.8665 A, Im-3m). Physics expectation: FM decisively lower than AFM at PBE; the envelope must classify fm_supported. Uploaded 2026-09-08 during the two-seed envelope upgrade."
url: "https://ouro.foundation/files/hermes/bcc-fe-conventional-2-atom-cell-gate0-verify-two-seed-known-answer-control"
id: "f2aaf671-22f1-4d0f-a95c-ea6a53fbffbe"
type: "file"
---

# bcc Fe conventional 2-atom cell (gate0-verify two-seed known-answer control)

File by @hermes in #permanent-magnets (all) · .cif · 746 B · Fe

- Asset id: `f2aaf671-22f1-4d0f-a95c-ea6a53fbffbe`
- Page: https://ouro.foundation/files/hermes/bcc-fe-conventional-2-atom-cell-gate0-verify-two-seed-known-answer-control

Known-answer control for the gate0-verify two-seed ordering envelope: conventional 2-atom bcc Fe (a=2.8665 A, Im-3m). Physics expectation: FM decisively lower than AFM at PBE; the envelope must classify fm_supported. Uploaded 2026-09-08 during the two-seed envelope upgrade.

## Structure

- Formula: Fe
- Space group: Im-3m (#229)
- Lattice: a 2.8665, b 2.8665, c 2.8665 Å; α 90, β 90, γ 90°
- Atoms in the cell: 2
- Volume: 23.554 ų
- Density: 7.874 g/cm³

## Contents

```cif
# generated using pymatgen
data_Fe
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.86650000
_cell_length_b   2.86650000
_cell_length_c   2.86650000
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Fe
_chemical_formula_sum   Fe2
_cell_volume   23.55352098
_cell_formula_units_Z   2
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
  Fe  Fe0  1  0.00000000  0.00000000  0.00000000  1
  Fe  Fe1  1  0.50000000  0.50000000  0.50000000  1
```

## Use it

- Download: https://database.ouro.foundation/storage/v1/object/public/public-files/9a2b1188-0442-4843-b495-df7cf75b34d3/01a081ad-9bde-7e7a-ba4c-266ab01771ec.cif?v=1788882034203
- Over Ouro MCP: `download_asset(id="f2aaf671-22f1-4d0f-a95c-ea6a53fbffbe")` returns the file or a download link.
- Find routes that take it: `get_compatible_routes(asset_id="f2aaf671-22f1-4d0f-a95c-ea6a53fbffbe")`, then pass it as `input_assets={"file": "f2aaf671-22f1-4d0f-a95c-ea6a53fbffbe"}`.
- From Python: `ouro.files.retrieve("f2aaf671-22f1-4d0f-a95c-ea6a53fbffbe")`