Formation of the Ternary Complex Hydride Mg<sub>2</sub>FeH<sub>6</sub> from Magnesium Hydride (β-MgH<sub>2</sub>) and Iron: An Electron Microscopy and Energy-Loss Spectroscopy Study
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Bibliographic record
Abstract
We examined the formation of the ternary complex hydride phase Mg 2 FeH 6 during the thermal hydrogen absorption of a ball-milled powder mixture of MgH 2 and Fe. Analytical measurements, scanning transmission electron microscopy, and electron energy-loss spectroscopy, with the sample cooled to liquid nitrogen temperature, were utilized to identify the various phases present and to study the features of this phase transformation. The low-loss region of the electron energy-loss spectrum was mainly used to distinguish various constituents. Mg 2 FeH 6 was initially formed during ball milling of MgH 2 and Fe, demonstrating a co-continuous structure with MgH 2 and Mg. Upon the first desorption, this phase was transformed into elemental Mg and Fe. During the initial stages of the subsequent thermal absorption, MgH 2 was first formed with enhanced kinetics because of the presence of Fe. This was followed by the nucleation of Mg 2 FeH 6 between MgH 2 and Fe and its growth with a columnar morphology. This morphology was dictated by the diffusion direction of the atomic hydrogen from the catalytic Fe cap. As the Mg 2 FeH 6 columns grew, the capping Fe particle and the MgH 2 substrate were consumed. When the system was maintained at high temperature for a long time, these columnar Mg 2 FeH 6 structures coalesced into a semispherical morphology.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
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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 it