Tt‐Tt (Tt = Si, Ge) Dumb‐Bell Structures at Different Valence Electron Concentrations: Ln<sub>2</sub>MgSi<sub>2</sub> (Ln = La, Ce), Yb<sub>2</sub>Li<sub>0.5</sub>Ge<sub>2</sub>, and Yb<sub>1.75</sub>Mg<sub>0.75</sub>Si<sub>2</sub>
Bibliographic record
Abstract
Abstract The isostructural compounds Yb2MgSi2, La2.05Mg0.95Si2, and Ce2.05Mg0.95Si2, as well as Yb2Li0.5Ge2 and Yb1.75Mg0.75Si2, respectively, were synthesized from stoichiometric mixtures of the corresponding elements in sealed Nb‐ ampoules under argon atmosphere. The structures were determined by single crystal X‐ray diffraction: Yb2MgSi2 (P4/mbm (No. 127), a = 7.056(1), c = 4.130(1) Å3, Z = 2), La2.05Mg0.95Si2 (P4/mbm, a = 7.544(1), c = 4.464(1) Å3, Z = 2), and Ce2.05Mg0.95Si2 (P4/mbm, a = 7.425(1), c = 4.370(1) Å3, Z = 2), Yb2Li0.5Ge2 (Pnma (No. 62), a = 7.0601(6), b = 14.628(1), c = 7.6160(7) Å, V = 786.5Å3, Z = 4), Yb1.75Mg0.75Si2 (Pnma, a = 6.9796(1), b = 14.4009(1), c = 7.5357(1) Å, V = 757.43(2) Å3, Z = 4). All compounds contain exclusively Tt‐Tt dumb‐bells (Tt = Si, Ge). The Si‐Si Zintl anions exhibit only very small variations of bond lengths which seem to be more due to cation matrix effects than to effective bond orders.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 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 | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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 source (direct Gemma or distilled Codex), 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".