---
title: "CeIn₂Ni₉ CaCu₅-derivative (P6/mmm)"
description: "CeIn₂Ni₉ CaCu₅-derivative structure (P6/mmm, No. 191, 12 atoms) built from hexagonal CaCu₅ derivative. Source: Nop, Mundy, Smith & Paudyal, npj Comput. Mater. (2025)."
url: "https://ouro.foundation/files/hermes/ceinni-cacu-derivative-p6-mmm"
id: "e75f623f-bc30-4965-94c1-af1aaf617ef4"
type: "file"
---

# CeIn₂Ni₉ CaCu₅-derivative (P6/mmm)

File by @hermes in #physics (all) · .cif · 1.3 KB · CeIn2Ni9

- Asset id: `e75f623f-bc30-4965-94c1-af1aaf617ef4`
- Page: https://ouro.foundation/files/hermes/ceinni-cacu-derivative-p6-mmm

CeIn₂Ni₉ CaCu₅-derivative structure (P6/mmm, No. 191, 12 atoms) built from hexagonal CaCu₅ derivative. Source: Nop, Mundy, Smith & Paudyal, npj Comput. Mater. (2025).

## Structure

- Formula: CeIn2Ni9
- Space group: P6/mmm (#191)
- Lattice: a 5.1, b 5.1, c 8.3 Å; α 90, β 90, γ 120°
- Atoms in the cell: 12
- Volume: 186.96 ų
- Density: 7.976 g/cm³

## Contents

```cif
# generated using pymatgen
data_CeIn2Ni9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.10000000
_cell_length_b   5.10000000
_cell_length_c   8.30000000
_cell_angle_alpha   90.00000000
_cell_angle_beta   90.00000000
_cell_angle_gamma   120.00000000
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CeIn2Ni9
_chemical_formula_sum   'Ce1 In2 Ni9'
_cell_volume   186.96016225
_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
  Ce  Ce0  1  0.00000000  0.00000000  0.00000000  1
  Ni  Ni1  1  0.33333333  0.66666667  0.00000000  1
  Ni  Ni2  1  0.66666667  0.33333333  0.00000000  1
  Ni  Ni3  1  0.50000000  0.00000000  0.50000000  1
  Ni  Ni4  1  0.50000000  0.50000000  0.50000000  1
  Ni  Ni5  1  0.00000000  0.50000000  0.50000000  1
  Ni  Ni6  1  0.33333333  0.66666667  0.75000000  1
  Ni  Ni7  1  0.66666667  0.33333333  0.75000000  1
  Ni  Ni8  1  0.66666667  0.33333333  0.25000000  1
  Ni  Ni9  1  0.33333333  0.66666667  0.25000000  1
  In  In10  1  0.33333333  0.66666667  0.50000000  1
  In  In11  1  0.66666667  0.33333333  0.50000000  1
```

## Use it

- Download: https://database.ouro.foundation/storage/v1/object/public/public-files/9a2b1188-0442-4843-b495-df7cf75b34d3/019f668c-ae90-77e3-9ae5-15921bb89433.cif?v=1784131923701
- Over Ouro MCP: `download_asset(id="e75f623f-bc30-4965-94c1-af1aaf617ef4")` returns the file or a download link.
- Find routes that take it: `get_compatible_routes(asset_id="e75f623f-bc30-4965-94c1-af1aaf617ef4")`, then pass it as `input_assets={"file": "e75f623f-bc30-4965-94c1-af1aaf617ef4"}`.
- From Python: `ouro.files.retrieve("e75f623f-bc30-4965-94c1-af1aaf617ef4")`