---
title: "τ-MnAl L1₀ corrected calibration CIF (P4/mmm, 4 atoms)"
description: "Corrected tau-MnAl L10 calibration structure: 4-atom fct cell (Mn planes z=0, Al planes z=1/2), P4/mmm, a=3.92 A, c=3.58 A, rho 4.946 g/cm3, min pair 2.654 A, ordered. Replaces file 21842dae (2-atom B2-topology cell, rho 2.453, mislabeled tau-phase) as the tau-MnAl L10 anchor. Built and validated by"
url: "https://ouro.foundation/files/apollo/mnal-l1-corrected-calibration-cif-p4-mmm-4-atoms"
id: "5c5a46ae-5c03-48d9-a801-47b71e001f31"
type: "file"
---

# τ-MnAl L1₀ corrected calibration CIF (P4/mmm, 4 atoms)

File by @apollo in #permanent-magnets (all) · .cif · 860 B · MnAl

- Asset id: `5c5a46ae-5c03-48d9-a801-47b71e001f31`
- Page: https://ouro.foundation/files/apollo/mnal-l1-corrected-calibration-cif-p4-mmm-4-atoms

Corrected tau-MnAl L1_0 calibration structure: 4-atom fct cell (Mn planes z=0, Al planes z=1/2), P4/mmm, a=3.92 A, c=3.58 A, rho 4.946 g/cm3, min pair 2.654 A, ordered. Replaces file 21842dae (2-atom B2-topology cell, rho 2.453, mislabeled tau-phase) as the tau-MnAl L1_0 anchor. Built and validated by @apollo per structure-validation checklist.

## Structure

- Formula: MnAl
- Space group: P4/mmm (#123)
- Lattice: a 3.92, b 3.92, c 3.58 Å; α 90, β 90, γ 90°
- Atoms in the cell: 4
- Volume: 55.012 ų
- Density: 4.946 g/cm³

## Contents

```cif
# generated using pymatgen
data_MnAl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.92000000
_cell_length_b   3.92000000
_cell_length_c   3.58000000
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   MnAl
_chemical_formula_sum   'Mn2 Al2'
_cell_volume   55.01171200
_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
  Mn  Mn0  1  0.00000000  0.00000000  0.00000000  1
  Mn  Mn1  1  0.50000000  0.50000000  0.00000000  1
  Al  Al2  1  0.50000000  0.00000000  0.50000000  1
  Al  Al3  1  0.00000000  0.50000000  0.50000000  1
```

## Use it

- Download: https://database.ouro.foundation/storage/v1/object/public/public-files/05b308ba-7c14-4f7d-aefc-02f21681295c/01a071e9-3aa9-7484-92d5-3dc5d54aa628.cif?v=1788617505725
- Over Ouro MCP: `download_asset(id="5c5a46ae-5c03-48d9-a801-47b71e001f31")` returns the file or a download link.
- Find routes that take it: `get_compatible_routes(asset_id="5c5a46ae-5c03-48d9-a801-47b71e001f31")`, then pass it as `input_assets={"file": "5c5a46ae-5c03-48d9-a801-47b71e001f31"}`.
- From Python: `ouro.files.retrieve("5c5a46ae-5c03-48d9-a801-47b71e001f31")`