Magnesium Double Nitride Mg<sub>3</sub>GaN<sub>3</sub> as New Host Lattice for Eu<sup>2+</sup> Doping: Synthesis, Structural Studies, Luminescence, and Band-Gap Determination
Bibliographic record
Abstract
The double nitride Mg 3 GaN 3 and binary nitride Mg 3 N 2 were synthesized from the elements by reaction with NaN 3 in a sodium flux. Reactions were carried out at 760 °C in welded shut tantalum ampules. Mg 3 GaN 3 was obtained as single crystals (space group R 3̅ m (No. 166), a = 3.3939(5) Å and c = 25.854(5) Å, Z = 3, R 1 = 0.0252, wR 2 = 0.0616 for 10 refined parameters, 264 diffraction data points). This double nitride consists of an uncharged three-dimensional network of MgN 4 and mixed (Mg/Ga)N 4 tetrahedra, which share common corners and edges. First-principles density functional theory (DFT) calculations predict Mg 3 GaN 3 to have a direct band gap of 3.0 eV, a value supported by soft X-ray spectroscopy measurements at the N K-edge. Eu 2+ -doped samples show yellow luminescence when irradiated with UV to blue light (λ max = 578 nm, full width at half maximum (fwhm) = 132 nm). Eu 2+ -doped samples of Mg 3 N 2 also show luminescence at room temperature when excited with ultraviolet (UV) to blue light. The maximum intensity of the emission band is found at 589 nm (fwhm = 145 nm).
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".