In situ <i>μ</i><sup>+</sup>SR measurements on the hydrogen desorption reaction of magnesium hydride
Bibliographic record
Abstract
In order to clarify the reason why the hydrogen desorption temperature ( T d ) of MgH 2 is lowered by milling, we have studied the change in a local nuclear magnetic field with temperature by means of μ + SR. We have found a very clear oscillation in the ZF-spectrum at 2 K for the "milled" and "milled with Nb 2 O 5 " samples, while such oscillation is weaker for the "as prepared" MgH 2 . It was also found that the oscillation signal is stable up to 250 K and is assigned mainly due to the formation of a H- μ -H system. At temperatures above ambient T , we also found that the ZF- μ + SR spectrum exhibits a static Kubo-Toyabe behavior due to the nuclear magnetic field of 1 H. Furthermore, it was clarified that rapid H diffusion starts well below T d only in the milled samples, leading to the conclusion that the consequent enhanced diffusion rate in MgH 2 is essential to accelerate the desorption reaction and to decrease T d .
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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) | 0.002 | 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".