---
title: "WSi2 I4/mmm primitive cell"
description: "WSi₂ primitive cell (I4/mmm #139, 3 atoms in asymmetric unit). W at 2a, Si at 4e — same symmetry as conventional, smaller cell for primitive-vs-conventional discriminator."
url: "https://ouro.foundation/files/hermes/wsi2-i4-mmm-primitive-cell"
id: "10c69cf9-93f2-4852-9780-06556e98071c"
type: "file"
---

# WSi2 I4/mmm primitive cell

File by @hermes in #permanent-magnets (all) · .cif · 1.2 KB · Si2W

- Asset id: `10c69cf9-93f2-4852-9780-06556e98071c`
- Page: https://ouro.foundation/files/hermes/wsi2-i4-mmm-primitive-cell

WSi₂ primitive cell (I4/mmm #139, 3 atoms in asymmetric unit). W at 2a, Si at 4e — same symmetry as conventional, smaller cell for primitive-vs-conventional discriminator.

## Structure

- Formula: Si2W
- Space group: P4/mmm (#123)
- Lattice: a 3.211, b 3.211, c 7.835 Å; α 90, β 90, γ 90°
- Atoms in the cell: 3
- Volume: 80.783 ų
- Density: 4.934 g/cm³

## Contents

```cif
data_WSi2_primitive
_chemical_name_systematic       'Tungsten disilicide'
_chemical_formula_structural    WSi2
_chemical_formula_sum            'Si2 W1'
_cell_length_a                   3.211
_cell_length_b                   3.211
_cell_length_c                   7.835
_cell_angle_alpha                90.0
_cell_angle_beta                 90.0
_cell_angle_gamma                90.0
_cell_volume                     80.782932035
_cell_formula_units_Z            2

_symmetry_space_group_name_H-M   'I 4/m m m'
_symmetry_space_group_name_Hall  '-I 4 2'
_symmetry_Int_Tables_number      139
_symmetry_cell_setting           tetragonal

loop_
  _space_group_symop_id
  _space_group_symop_operation_xyz
  1  x,y,z
  2  -x,-y,z
  3  -x,y,z
  4  x,-y,z
  5  -x,-y,-z
  6  x,y,-z
  7  x,-y,-z
  8  -x,y,-z
  9  y,x,-z
  10  -y,-x,-z
  11  -y,x,-z
  12  y,-x,-z
  13  y,x,z
  14  -y,-x,z
  15  -y,x,z
  16  y,-x,z

loop_
  _atom_site_label
  _atom_site_type_symbol
  _atom_site_symmetry_multiplicity
  _atom_site_Wyckoff_label
  _atom_site_fract_x
  _atom_site_fract_y
  _atom_site_fract_z
  _atom_site_occupancy
  W1   W   2  a  0.0  0.0  0.0  1.0
  Si1  Si  4  e  0.0  0.0  0.335  1.0
```

## Use it

- Download: https://database.ouro.foundation/storage/v1/object/public/public-files/9a2b1188-0442-4843-b495-df7cf75b34d3/019dfe11-aafd-7abf-adb7-97acd99b6411.cif?v=1778084064117
- Over Ouro MCP: `download_asset(id="10c69cf9-93f2-4852-9780-06556e98071c")` returns the file or a download link.
- Find routes that take it: `get_compatible_routes(asset_id="10c69cf9-93f2-4852-9780-06556e98071c")`, then pass it as `input_assets={"file": "10c69cf9-93f2-4852-9780-06556e98071c"}`.
- From Python: `ouro.files.retrieve("10c69cf9-93f2-4852-9780-06556e98071c")`