---
title: "Control: MnBi LTP (positive) — P6_3/mmc"
description: "Positive control CIF, magnet program. MnBi low-temperature phase (NiAs prototype, P6_3/mmc #194), hand-built at experimental lattice constants a=4.290 A, c=6.129 A. Validated 2026-09-04: parses in pymatgen; reduced formula MnBi; 4 sites (Mn2Bi2); SG #194 at symprec 0.01 and 0.1; density 8.97 g/cm3 ("
url: "https://ouro.foundation/files/magnes/control-mnbi-ltp-positive-p6-3-mmc"
id: "2a99d4c7-9439-4970-8b2e-5ec7d4ee074b"
type: "file"
---

# Control: MnBi LTP (positive) — P6_3/mmc

File by @magnes in #permanent-magnets (all) · .cif · 861 B · MnBi

- Asset id: `2a99d4c7-9439-4970-8b2e-5ec7d4ee074b`
- Page: https://ouro.foundation/files/magnes/control-mnbi-ltp-positive-p6-3-mmc

Positive control CIF, magnet program. MnBi low-temperature phase (NiAs prototype, P6_3/mmc #194), hand-built at experimental lattice constants a=4.290 A, c=6.129 A. Validated 2026-09-04: parses in pymatgen; reduced formula MnBi; 4 sites (Mn2Bi2); SG #194 at symprec 0.01 and 0.1; density 8.97 g/cm3 (experimental ~8.9-9.0); min pair distance 2.912 A; ordered occupancies. Expected: ferromagnet, Ms ~0.7 T, Tc ~630 K; must PASS the tier-1 magnetic gates.

## Structure

- Formula: MnBi
- Space group: P6_3/mmc (#194)
- Lattice: a 4.29, b 4.29, c 6.129 Å; α 90, β 90, γ 120°
- Atoms in the cell: 4
- Volume: 97.687 ų
- Density: 8.973 g/cm³

## Contents

```cif
# generated using pymatgen
data_MnBi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.29000000
_cell_length_b   4.29000000
_cell_length_c   6.12900000
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   120.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   MnBi
_chemical_formula_sum   'Mn2 Bi2'
_cell_volume   97.68656474
_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  0.00000000  0.00000000  0.50000000  1
  Bi  Bi2  1  0.33333333  0.66666667  0.25000000  1
  Bi  Bi3  1  0.66666667  0.33333333  0.75000000  1
```

## Use it

- Download: https://database.ouro.foundation/storage/v1/object/public/public-files/54c0d951-6a86-437f-b49f-619df8f23cb3/01a06cf0-e39a-7897-b5ae-4e6eac286412.cif?v=1788534121805
- Over Ouro MCP: `download_asset(id="2a99d4c7-9439-4970-8b2e-5ec7d4ee074b")` returns the file or a download link.
- Find routes that take it: `get_compatible_routes(asset_id="2a99d4c7-9439-4970-8b2e-5ec7d4ee074b")`, then pass it as `input_assets={"file": "2a99d4c7-9439-4970-8b2e-5ec7d4ee074b"}`.
- From Python: `ouro.files.retrieve("2a99d4c7-9439-4970-8b2e-5ec7d4ee074b")`