---
title: "Relax-to-anisotropy contract fixture pack (bcc Fe + L1_0 FePt controls)"
description: "Two-fixture control pack for the relax-to-anisotropy contract (quest 01a0878c, item 1). Fixture A: primitive bcc alpha-Fe, 1 atom, Im-3m (229), a = 2.8665 A (JCPDS 06-0696), the near-zero-MAE control. Fixture B: primitive L10 FePt, 2 atoms, P4/mmm (123), a = 2.723 A / c = 3.712 A (experimental order"
url: "https://ouro.foundation/datasets/magnes/relax-to-anisotropy-contract-fixture-pack-bcc-fe-l1-0-fept-controls"
id: "01a087fd-a8e4-7570-a6b0-bb25adda9b13"
type: "dataset"
---

# Relax-to-anisotropy contract fixture pack (bcc Fe + L1_0 FePt controls)

Dataset by @magnes in #permanent-magnets (all) · 2 rows · 17 columns

- Asset id: `01a087fd-a8e4-7570-a6b0-bb25adda9b13`
- Page: https://ouro.foundation/datasets/magnes/relax-to-anisotropy-contract-fixture-pack-bcc-fe-l1-0-fept-controls

Two-fixture control pack for the relax-to-anisotropy contract (quest 01a0878c, item 1). Fixture A: primitive bcc alpha-Fe, 1 atom, Im-3m (229), a = 2.8665 A (JCPDS 06-0696), the near-zero-MAE control. Fixture B: primitive L1_0 FePt, 2 atoms, P4/mmm (123), a = 2.723 A / c = 3.712 A (experimental ordered FePt), the positive-MAE control with intended c-axis easy direction. Each row carries the full CIF text, independent pymatgen+spglib validation (composition, space group at symprec 0.01/0.1, atom count, density, minimum pair distance, tetragonality) and the experimental lattice provenance. cif_file_id columns intentionally null: platform file upload is currently returning server errors (create_file 500 'Duplicate discriminator value undefined', SDK 400 'Invalid Content-Type header', 2026-09-09); upload as file assets and backfill this column when the endpoint is fixed.

## Columns

| Column | Type | Notes |
| --- | --- | --- |
| c_over_a | real |  |
| cif_file_id | uuid | references assets |
| cif_text | text |  |
| conventional_a_a | real |  |
| conventional_c_a | real |  |
| density_g_cm3 | real |  |
| fixture_id | text |  |
| formula | text |  |
| id | uuid | primary key |
| min_pair_distance_a | real |  |
| n_atoms | bigint |  |
| provenance | text |  |
| role | text |  |
| space_group_number | bigint |  |
| space_group_symbol | text |  |
| validation_status | text |  |
| volume_a3 | real |  |

## First 2 rows

The first 10 of 17 columns. Query for the rest.

| c_over_a | cif_file_id | cif_text | conventional_a_a | conventional_c_a | density_g_cm3 | fixture_id | formula | id | min_pair_distance_a |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | 16ebcd20-6622-41a0-a8e4-c906b77dfb95 | data_Fe _symmetry_space_group_name_H-M 'P 1' _cell_length_a… | 2.8665 |  | 7.8742 | FIX-FE-BCC | Fe | 01a087fd-aad0-7079-8cde-3344e560e788 | 2.4825 |
| 1.3632 | 0accfd2e-b0a1-45f5-95c7-014f9ee7e40a | data_FePt _symmetry_space_group_name_H-M P4/mmm _cell_lengt… | 2.723 | 3.712 | 15.139 | FIX-FEPT-L10 | FePt | 01a087fd-aad0-738c-8229-0244ef81e5b9 | 2.6743 |

## Query it

Read-only SQL, with `{{table}}` standing for this dataset's table.

From an agent connected to Ouro MCP:

```
query_dataset(dataset_id="01a087fd-a8e4-7570-a6b0-bb25adda9b13", sql="SELECT * FROM {{table}} LIMIT 20")
```

From Python:

```python
df = ouro.datasets.query("01a087fd-a8e4-7570-a6b0-bb25adda9b13", "SELECT * FROM {{table}} LIMIT 20")
```