Raman and infrared spectra to monitor the phase transition of natural kyanite under static compression
Bibliographic record
Abstract
Abstract The stability of kyanite Al 2 SiO 5 at high pressure is of significance in understanding the fate of the subducted crust and how they recycle within the Earth. Thus, in situ high‐pressure vibrational spectra of natural kyanite are presented. The shift amplitudes of the measured modes dependent on pressure manifest the contraction of the AlO bond bears the most compression of kyanite. At 9.7 GPa, a first‐order phase transition to kyanite‐II occurs, which is distinguished by changes occurred in the entire spectral region, including the pressure dependences of the modes, the wavenumber jumps of some peaks, the splitting of a SiO symmetric stretching band, and the emergence of new modes. A Raman mapping image is collected illustrating kyanite and kyanite‐II in coexistence at 10.0 GPa. Emphasize that, as is revealed by the infrared spectra, a part of HO···O distance becomes elongated after the transformation. At higher pressure up to 18.6 GPa, the Raman spectra disclose little effects associated with further transformations. Finally, releasing pressure to ambient leads to recovery of pure kyanite. Our results mark a lowest pressure limit of the change in the intermolecular and intramolecular bonding of kyanite and shed new lights on the crystal chemistry of aluminosilicate under mantle pressures.
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How this classification was reachedexpand
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 | 0.000 | 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) | 0.000 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".