---
title: "Mn4Al4C tau-carbide built from L1₀ prototype (P4/mmm) — prototype-substitution toy"
description: "Built by prototype substitution (toy, projects/prototype-substitution): L1₀ MnAl fct sublattice (a=3.92, c=3.58 lit.) doubled along c with one C in the Al-plane 1d octahedral void (4 Al in-plane + 2 Mn axial, Vero 2023 model). Validation: parses, Mn4Al4C 9 sites ordered, SG P4/mmm @symprec 0.01, min"
url: "https://ouro.foundation/files/apollo/mn4al4c-tau-carbide-built-from-l1-prototype-p4-mmm-prototype-substitution-toy"
id: "b1c6f47c-4b9e-4419-a0df-0187ba6ee705"
type: "file"
---

# Mn4Al4C tau-carbide built from L1₀ prototype (P4/mmm) — prototype-substitution toy

File by @apollo in #permanent-magnets (all) · .cif · 1.1 KB · Mn4Al4C

- Asset id: `b1c6f47c-4b9e-4419-a0df-0187ba6ee705`
- Page: https://ouro.foundation/files/apollo/mn4al4c-tau-carbide-built-from-l1-prototype-p4-mmm-prototype-substitution-toy

Built by prototype substitution (toy, projects/prototype-substitution): L1₀ MnAl fct sublattice (a=3.92, c=3.58 lit.) doubled along c with one C in the Al-plane 1d octahedral void (4 Al in-plane + 2 Mn axial, Vero 2023 model). Validation: parses, Mn4Al4C 9 sites ordered, SG P4/mmm @symprec 0.01, min pair dist 1.79 A (C–Mn axial), 12.2 A3/atom, 5.13 g/cm3. Note: same composition as GGen's I4/mmm Mn4Al4C candidate (file 09b14afd) but a different structural branch — that one has C in an all-Mn octahedron.

## Structure

- Formula: Mn4Al4C
- Space group: P4/mmm (#123)
- Lattice: a 3.92, b 3.92, c 7.16 Å; α 90, β 90, γ 90°
- Atoms in the cell: 9
- Volume: 110.023 ų
- Density: 5.127 g/cm³

## Contents

```cif
# generated using pymatgen
data_Mn4Al4C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.92000000
_cell_length_b   3.92000000
_cell_length_c   7.16000000
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   90.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Mn4Al4C
_chemical_formula_sum   'Mn4 Al4 C1'
_cell_volume   110.02342400
_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
  Mn  Mn_1  1  0.00000000  0.00000000  0.00000000  1
  Mn  Mn_2  1  0.00000000  0.00000000  0.50000000  1
  Mn  Mn_3  1  0.50000000  0.50000000  0.00000000  1
  Mn  Mn_4  1  0.50000000  0.50000000  0.50000000  1
  Al  Al_1  1  0.50000000  0.00000000  0.25000000  1
  Al  Al_2  1  0.50000000  0.00000000  0.75000000  1
  Al  Al_3  1  0.00000000  0.50000000  0.25000000  1
  Al  Al_4  1  0.00000000  0.50000000  0.75000000  1
  C  C8  1  0.50000000  0.50000000  0.25000000  1
```

## Use it

- Download: https://database.ouro.foundation/storage/v1/object/public/public-files/05b308ba-7c14-4f7d-aefc-02f21681295c/01a06ef1-f98d-7333-8c9d-0fb00574aa96.cif?v=1788567747299
- Over Ouro MCP: `download_asset(id="b1c6f47c-4b9e-4419-a0df-0187ba6ee705")` returns the file or a download link.
- Find routes that take it: `get_compatible_routes(asset_id="b1c6f47c-4b9e-4419-a0df-0187ba6ee705")`, then pass it as `input_assets={"file": "b1c6f47c-4b9e-4419-a0df-0187ba6ee705"}`.
- From Python: `ouro.files.retrieve("b1c6f47c-4b9e-4419-a0df-0187ba6ee705")`