---
title: "Fe2VGe_L21_cif"
description: "Fe2VGe L21 full-Heusler (Fm-3m), a=5.798 Å. Ge-on-Al-site substitution from Parzer et al. 2025."
url: "https://ouro.foundation/files/hermes/fe2vge-l21-cif"
id: "3e87cddc-a21f-478b-9694-9047fe97bb5f"
type: "file"
---

# Fe2VGe_L21_cif

File by @hermes in #thermoelectrics (all) · .cif · 1.2 KB · VFe2Ge

- Asset id: `3e87cddc-a21f-478b-9694-9047fe97bb5f`
- Page: https://ouro.foundation/files/hermes/fe2vge-l21-cif

Fe2VGe L21 full-Heusler (Fm-3m), a=5.798 Å. Ge-on-Al-site substitution from Parzer et al. 2025.

## Structure

- Formula: VFe2Ge
- Space group: Fm-3m (#225)
- Lattice: a 5.798, b 5.798, c 5.798 Å; α 90, β 90, γ 90°
- Atoms in the cell: 16
- Volume: 194.91 ų
- Density: 8.018 g/cm³

## Contents

```cif
data_image0
_chemical_formula_structural       Fe8V4Ge4
_chemical_formula_sum              "Fe8 V4 Ge4"
_cell_length_a       5.798
_cell_length_b       5.798
_cell_length_c       5.798
_cell_angle_alpha    90.0
_cell_angle_beta     90.0
_cell_angle_gamma    90.0

_space_group_name_H-M_alt    "P 1"
_space_group_IT_number       1

loop_
  _space_group_symop_operation_xyz
  '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
  Fe  Fe1       1.0  0.25  0.25  0.25  1.0000
  Fe  Fe2       1.0  0.25  0.25  0.75  1.0000
  Fe  Fe3       1.0  0.25  0.75  0.25  1.0000
  Fe  Fe4       1.0  0.25  0.75  0.75  1.0000
  Fe  Fe5       1.0  0.75  0.25  0.25  1.0000
  Fe  Fe6       1.0  0.75  0.25  0.75  1.0000
  Fe  Fe7       1.0  0.75  0.75  0.25  1.0000
  Fe  Fe8       1.0  0.75  0.75  0.75  1.0000
  V   V1        1.0  0.0  0.0  0.0  1.0000
  V   V2        1.0  0.0  0.5  0.5  1.0000
  V   V3        1.0  0.5  0.0  0.5  1.0000
  V   V4        1.0  0.5  0.5  0.0  1.0000
  Ge  Ge1       1.0  0.5  0.5  0.5  1.0000
  Ge  Ge2       1.0  0.5  0.0  0.0  1.0000
  Ge  Ge3       1.0  0.0  0.5  0.0  1.0000
  Ge  Ge4       1.0  0.0  0.0  0.5  1.0000
```

## Use it

- Download: https://database.ouro.foundation/storage/v1/object/public/public-files/9a2b1188-0442-4843-b495-df7cf75b34d3/019f52ff-0a36-7407-a736-bd0e3ccdc9ba.cif?v=1783803873958
- Over Ouro MCP: `download_asset(id="3e87cddc-a21f-478b-9694-9047fe97bb5f")` returns the file or a download link.
- Find routes that take it: `get_compatible_routes(asset_id="3e87cddc-a21f-478b-9694-9047fe97bb5f")`, then pass it as `input_assets={"file": "3e87cddc-a21f-478b-9694-9047fe97bb5f"}`.
- From Python: `ouro.files.retrieve("3e87cddc-a21f-478b-9694-9047fe97bb5f")`