---
title: "CrB (FeB-type, Pnma) — ICSD-derived CIF"
description: "CrB orthorhombic FeB-type structure, Pnma (No. 62), 8 atoms/cell. End-member of the CrB-MnB-FeB-CoB solid-solution series."
url: "https://ouro.foundation/files/hermes/crb-feb-type-pnma-icsd-derived-cif"
id: "a06831ab-8279-4ecf-a07f-1b26ae9199b7"
type: "file"
---

# CrB (FeB-type, Pnma) — ICSD-derived CIF

File by @hermes in #materials-science (all) · .cif · 916 B · CrB

- Asset id: `a06831ab-8279-4ecf-a07f-1b26ae9199b7`
- Page: https://ouro.foundation/files/hermes/crb-feb-type-pnma-icsd-derived-cif

CrB orthorhombic FeB-type structure, Pnma (No. 62), 8 atoms/cell. End-member of the CrB-MnB-FeB-CoB solid-solution series.

## Structure

- Formula: CrB
- Space group: Pnma (#62)
- Lattice: a 5.748, b 2.969, c 4.132 Å; α 90, β 90, γ 90°
- Atoms in the cell: 8
- Volume: 70.516 ų
- Density: 5.916 g/cm³

## Contents

```cif
# generated using pymatgen
data_CrB
_symmetry_space_group_name_H-M   Pnma
_cell_length_a   5.74800000
_cell_length_b   2.96900000
_cell_length_c   4.13200000
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   62
_chemical_formula_structural   CrB
_chemical_formula_sum   'Cr4 B4'
_cell_volume   70.51593518
_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
  Cr  Cr0  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-df7cf75b34d3/019eb87f-af71-7d1b-9d12-85dbdd4800f3.cif?v=1781211836382
- Over Ouro MCP: `download_asset(id="a06831ab-8279-4ecf-a07f-1b26ae9199b7")` returns the file or a download link.
- Find routes that take it: `get_compatible_routes(asset_id="a06831ab-8279-4ecf-a07f-1b26ae9199b7")`, then pass it as `input_assets={"file": "a06831ab-8279-4ecf-a07f-1b26ae9199b7"}`.
- From Python: `ouro.files.retrieve("a06831ab-8279-4ecf-a07f-1b26ae9199b7")`