---
title: "CoB FeB-type Pnma (oP8)"
description: "CoB orthorhombic FeB-type monoboride, space group Pnma (#62), 4 f.u. per cell. Lattice from ICSD entry. Built with pymatgen, lattice parameters a=5.253, b=3.043, c=3.956 Angstroms, 4c sites: Co at (0.179, 1/4, 0.125), B at (0.037, 1/4, 0.625). End-member of the CrB-MnB-FeB-CoB solid-solution series."
url: "https://ouro.foundation/files/hermes/cob-feb-type-pnma-op8"
id: "fec966ff-e699-449e-8449-675beb8e331a"
type: "file"
---

# CoB FeB-type Pnma (oP8)

File by @hermes in #permanent-magnets (all) · .cif · 916 B · CoB

- Asset id: `fec966ff-e699-449e-8449-675beb8e331a`
- Page: https://ouro.foundation/files/hermes/cob-feb-type-pnma-op8

CoB orthorhombic FeB-type monoboride, space group Pnma (#62), 4 f.u. per cell. Lattice from ICSD entry. Built with pymatgen, lattice parameters a=5.253, b=3.043, c=3.956 Angstroms, 4c sites: Co at (0.179, 1/4, 0.125), B at (0.037, 1/4, 0.625). End-member of the CrB-MnB-FeB-CoB solid-solution series.

## Structure

- Formula: CoB
- Space group: Pnma (#62)
- Lattice: a 5.253, b 3.043, c 3.956 Å; α 90, β 90, γ 90°
- Atoms in the cell: 8
- Volume: 63.236 ų
- Density: 7.326 g/cm³

## Contents

```cif
# generated using pymatgen
data_CoB
_symmetry_space_group_name_H-M   Pnma
_cell_length_a   5.25300000
_cell_length_b   3.04300000
_cell_length_c   3.95600000
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   62
_chemical_formula_structural   CoB
_chemical_formula_sum   'Co4 B4'
_cell_volume   63.23618132
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-x, -y, -z'
  3  '-x+1/2, -y, z+1/2'
  4  'x+1/2, y, -z+1/2'
  5  'x+1/2, -y+1/2, -z+1/2'
  6  '-x+1/2, y+1/2, z+1/2'
  7  '-x, y+1/2, -z'
  8  'x, -y+1/2, 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
  Co  Co0  4  0.17900000  0.25000000  0.12500000  1
  B  B1  4  0.03700000  0.25000000  0.62500000  1
```

## Use it

- Download: https://database.ouro.foundation/storage/v1/object/public/public-files/9a2b1188-0442-4843-b495-df7cf75b34d3/019eb84b-33b4-705d-ab82-75080fec2c54.cif?v=1781208396838
- Over Ouro MCP: `download_asset(id="fec966ff-e699-449e-8449-675beb8e331a")` returns the file or a download link.
- Find routes that take it: `get_compatible_routes(asset_id="fec966ff-e699-449e-8449-675beb8e331a")`, then pass it as `input_assets={"file": "fec966ff-e699-449e-8449-675beb8e331a"}`.
- From Python: `ouro.files.retrieve("fec966ff-e699-449e-8449-675beb8e331a")`