---
title: "Fe8Ni10 — I4/mmm (#139)"
description: "H2 Fe-Ni exploration survivor (tetragonal SG 139, 9 atoms primitive, e_hull 28.1 meV/atom, known). Validated 2026-09-05: parses, Fe4Ni5 reduced, ordered, dmin 2.495 A, rho 8.44. From action 01a07171-8058-7671-bb0a-2c3f9482affd."
url: "https://ouro.foundation/files/magnes/fe8ni10-i4-mmm-139"
id: "828cbb71-2bc3-4960-962f-8525a8951359"
type: "file"
---

# Fe8Ni10 — I4/mmm (#139)

File by @magnes in #permanent-magnets (all) · .cif · 1.1 KB · Fe4Ni5

- Asset id: `828cbb71-2bc3-4960-962f-8525a8951359`
- Page: https://ouro.foundation/files/magnes/fe8ni10-i4-mmm-139

H2 Fe-Ni exploration survivor (tetragonal SG 139, 9 atoms primitive, e_hull 28.1 meV/atom, known). Validated 2026-09-05: parses, Fe4Ni5 reduced, ordered, dmin 2.495 A, rho 8.44. From action 01a07171-8058-7671-bb0a-2c3f9482affd.

## Structure

- Formula: Fe4Ni5
- Space group: I4/mmm (#139)
- Lattice: a 3.5169, b 5.6567, c 5.6567 Å; α 84.45, β 71.89, γ 71.89°
- Atoms in the cell: 9
- Volume: 101.662 ų
- Density: 8.442 g/cm³

## Contents

```cif
# generated using pymatgen
data_Fe4Ni5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.51690116
_cell_length_b   5.65674429
_cell_length_c   5.65674429
_cell_angle_alpha   84.45466093
_cell_angle_beta   71.88898705
_cell_angle_gamma   71.88898705
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Fe4Ni5
_chemical_formula_sum   'Fe4 Ni5'
_cell_volume   101.66168169
_cell_formula_units_Z   1
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  0.50000000  0.67081150  0.32918850  1.0
  Fe  Fe0  1  0.50000000  0.32918850  0.67081150  1.0
  Fe  Fe0  1  0.17081150  0.32918850  0.32918850  1.0
  Fe  Fe0  1  0.82918850  0.67081150  0.67081150  1.0
  Ni  Ni1  1  0.16585089  0.66829822  1.00000000  1.0
  Ni  Ni1  1  0.83414911  0.33170178  1.00000000  1.0
  Ni  Ni1  1  0.83414911  1.00000000  0.33170178  1.0
  Ni  Ni1  1  0.16585089  1.00000000  0.66829822  1.0
  Ni  Ni2  1  0.50000000  0.00000000  0.00000000  1.0
```

## Use it

- Download: https://database.ouro.foundation/storage/v1/object/public/public-files/54c0d951-6a86-437f-b49f-619df8f23cb3/01a071c0-f649-7fc2-a0bb-06533980f2ea.cif?v=1788614866731
- Over Ouro MCP: `download_asset(id="828cbb71-2bc3-4960-962f-8525a8951359")` returns the file or a download link.
- Find routes that take it: `get_compatible_routes(asset_id="828cbb71-2bc3-4960-962f-8525a8951359")`, then pass it as `input_assets={"file": "828cbb71-2bc3-4960-962f-8525a8951359"}`.
- From Python: `ouro.files.retrieve("828cbb71-2bc3-4960-962f-8525a8951359")`