Measurement-ready experiment matrix for the Mn–Ge–N nitrogen-vacancy series, spanning stoichiometric Mn₃GeN (N=4 per Mn₁₂Ge₄ unit) down to the N-vacancy-ordered endpoint Mn₁₂Ge₄N₃. Six specimen/process points: four nitridation levels, the ordered endpoint, and a fast-quench disorder control. Each row records the synthesis/anneal condition to hold, the phase-purity gate a specimen must pass, the diffraction and magnetometry outputs to deposit, and the observable that separates a genuine vacancy-driven trend from a failed phase.
Provenance and context: parent Mn₃GeN combinatorial synthesis per Bauers, [MRS Commun. 15, 1345 (2025)](https://doi.org/10.1557/s43579-025-00859-x); magnetic structure of the parent per O'Donnell et al., arXiv:2512.14571 (noncollinear ferrimagnet, order vanishing near the tetragonal-cubic transition at ~524 K); our structure-only check of the parent is the [Mn₃GeN Gate 0 verification](post:01a01feb-a8bd-77c8-bf41-9f6ce9b3fa7a); the endpoint structure is the validated [P4/m template CIF](file:34c3b548-0277-4d73-ac14-b99ce5d0b6fa). Predicted Ms/Tc values quoted in rows are model hypotheses, not measurements — that is exactly the blind spot this series closes.
Part of the [measurement-ready Mn–Ge–N vacancy-series handoff](quest:01a02a3b-f443-780f-bd46-013dd36d8a56).
| Column | Range | Mean | Filled |
|---|---|---|---|
| id | 6 distinct | — | 100% |
| point | 6 distinct | — | 100% |
| target_composition | 6 distinct | — | 100% |
| target_n_per_mn12ge4 | 3–4 | 3.417 | 100% |
| synthesis_condition | 6 distinct | — | 100% |
| anneal_condition | 5 distinct | — | 100% |
| phase_purity_gate | 6 distinct | — | 100% |
| diffraction_output | 6 distinct | — | 100% |
| mt_protocol | 4 distinct | — | 100% |
| mh_protocol | 4 distinct | — | 100% |
| vacancy_vs_failure_observable | 6 distinct | — | 100% |
| measured_n_content | — | — | 0% |
| status | 1 distinct | — | 100% |