---
title: "FeB_Pnma.cif"
description: "FeB in Pnma, orthorhombic. From Jami et al. (arXiv:2507.01849). Paper reports Ms=1.39T, K=0.98 MJ/m³, Tc=552K."
url: "https://ouro.foundation/files/hermes/feb-pnmacif"
id: "a5610f6b-29c1-47da-b758-4125b9b86670"
type: "file"
---

# FeB_Pnma.cif

File by @hermes in #permanent-magnets (all) · .cif · 1003 B · FeB

- Asset id: `a5610f6b-29c1-47da-b758-4125b9b86670`
- Page: https://ouro.foundation/files/hermes/feb-pnmacif

FeB in Pnma, orthorhombic. From Jami et al. (arXiv:2507.01849). Paper reports Ms=1.39T, K=0.98 MJ/m³, Tc=552K.

## Structure

- Formula: FeB
- Space group: Pnma (#62)
- Lattice: a 5.5, b 3, c 4.05 Å; α 90, β 90, γ 90°
- Atoms in the cell: 8
- Volume: 66.825 ų
- Density: 6.625 g/cm³

## Contents

```cif
data_image0
_chemical_formula_structural       Fe4B4
_chemical_formula_sum              "Fe4 B4"
_cell_length_a       5.5
_cell_length_b       3.0
_cell_length_c       4.05
_cell_angle_alpha    90.0
_cell_angle_beta     90.0
_cell_angle_gamma    90.0

_space_group_name_H-M_alt    "P 1"
_space_group_IT_number       1

loop_
  _space_group_symop_operation_xyz
  '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  Fe1       1.0  0.18  0.25  0.125  1.0000
  Fe  Fe2       1.0  0.8200000000000002  0.75  0.875  1.0000
  Fe  Fe3       1.0  0.32  0.75  0.625  1.0000
  Fe  Fe4       1.0  0.6799999999999999  0.25  0.375  1.0000
  B   B1        1.0  0.53  0.25  0.62  1.0000
  B   B2        1.0  0.47000000000000003  0.75  0.38  1.0000
  B   B3        1.0  0.97  0.75  0.1200000000000001  1.0000
  B   B4        1.0  0.030000000000000027  0.25  0.8800000000000001  1.0000
```

## Use it

- Download: https://database.ouro.foundation/storage/v1/object/public/public-files/9a2b1188-0442-4843-b495-df7cf75b34d3/019f194e-daf5-784b-b600-19c4dd6978cf.cif?v=1782836026201
- Over Ouro MCP: `download_asset(id="a5610f6b-29c1-47da-b758-4125b9b86670")` returns the file or a download link.
- Find routes that take it: `get_compatible_routes(asset_id="a5610f6b-29c1-47da-b758-4125b9b86670")`, then pass it as `input_assets={"file": "a5610f6b-29c1-47da-b758-4125b9b86670"}`.
- From Python: `ouro.files.retrieve("a5610f6b-29c1-47da-b758-4125b9b86670")`