Modification of the H<sub>2</sub> Desorption Properties of LiAlH<sub>4</sub> through Doping with Ti
Why this work is in the frame
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Bibliographic record
Abstract
Undoped LiAlH 4 displays complex thermal behavior in which melting at ∼170 °C is accompanied by spontaneous decomposition to produce Al, H 2, and Li 3 AlH 6: this latter species then decomposes further to LiH, H 2, and Al at ∼225 °C. For undoped LiAlH 4, melting corresponds to initial absorption, then release, of the latent heat of fusion as LiAlH 4 decomposes to LiH, Li 3 AlH 6, Al, and H 2, and the first three species spontaneously solidify. Doping LiAlH 4 with low levels of TiCl 3 advances its thermal decomposition by 60−75 °C, bringing this event below the melting point of LiAlH 4 and uncoupling it from the composite melting−decomposition−solidification event that appears at ca. 170 °C for the undoped material. As a result, the desorption of H 2 from both LiAlH 4 and Li 3 AlH 6 are each revealed to be intrinsically endothermic events, in contrast with previous reports that described the decomposition of LiAlH 4 to produce H 2 as an exothermic process. Accordingly, the release of H 2 by Ti-doped LiAlH 4 may be varied and shut off by close control of the sample temperature, in contrast with the undoped material, whose H 2 release characteristics are compromised by its melting, with immediate spontaneous and uncontrolled decomposition.
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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) | 0.000 | 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) | 0.000 | 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 it