A New Ternary Phase, Called LaCuMg<sub>8</sub>, for Solid Hydrogen Storage. Influence of Ball Milling and Cold Rolling
Bibliographic record
Abstract
Recently, our group found a new phase with a composition close to LaCuMg8. This compound crystallizes in the La2Mg17 structure type. A similar hydrogen sorption behavior was observed for both La2Mg17 and LaCuMg8 compounds with a two steps mechanism. During the first step, LaCuMg8 absorbs around 3wt% with a low kinetic; the decomposition into LaH3, MgH2 and Cu2Mg is also observed. This first step is considered as the activation process. The second step consists in the reversible desorption/absorption of hydrogen by magnesium and also the reversible transformation of Mg2Cu into MgCu2. In order to improve the activation process, the influence of ball milling and cold rolling was tested. LaCuMg8 can not be synthesized by ball milling starting from elemental powders (LaCu + 8Mg). However, cold rolling on as-cast LaCuMg8 compound improves the activation. Indeed, more than 3%wt is absorbed after 1 hour which is 20 times faster than LaCuMg8 as cast. An effect of CuMg2, induced by cold rolling was proposed.
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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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
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".