Amorphization and post-amorphous phases of NaA Zeolite at high P–T conditions
Bibliographic record
Abstract
Hydrated NaA (hyd-NaA) and dehydrated NaA (deh-NaA) zeolites were studied at high P–T conditions (up to 4.5 GPa and 400 °C) by ex situ X-ray powder diffraction and in situ impedance spectroscopy. At compression of both synthetic zeolites in 1000-ton cubic press, the amorphization was observed in a wide pressure range at room T. At heating to 200–250 °C and compression to 2–3 GPa, a complete amorphous material was obtained from deh-NaA. After amorphization at high P–T, hyd-NaA zeolite transforms to new crystalline phases: carnegieite and nepheline. These amorphous-to-crystalline transformations in a low pressure range suggest the correlation of short-scale order parameters in both materials. The presence of water in hyd-NaA essentially changes the phase diagram. Phase transformations in zeolites may be studied by in situ impedance spectroscopy. Unusual ionic AC conductivity of hyd-NaA, characterized by high value and the Cole–Cole plot with broken line without any semicircle, was observed. The pressure range of high-conducting state increases with temperature and may be broader the measured interval of 0.8–4.5 GPa at 400 °C.
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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) | 0.001 | 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".