Effects of Grain Size, Cooling Rate, and Sample Preparation on the Phase Transition from Protoenstatite to Clinoenstatite
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Bibliographic record
Abstract
ABSTRACT X-ray diffraction experiments were carried out with protoenstatite, chemical composition Mg2Si2O6, in order to clarify the conditions under which protoenstatite can be retained at room temperature. Our results show that grain size, cooling rate, and shear stress during sample preparation clearly affect the transition from protoenstatite to clinoenstatite. Smaller protoenstatite grains were more likely to be retained, and the relationship between the retained volume ratio of the protoenstatite and grain size was statistically consistent with martensitic nucleation. The most protoenstatite was retained in the experiment using a cooling rate of 3 °C/min; the retained volume ratio decreased in experiments with both faster and slower cooling rates. The martensitic transformation of protoenstatite to clinoenstatite is promoted by shear stress caused by a fast cooling rate. Shear stress caused by grinding and polishing also promotes the transformation, but ion milling, used to prepare samples for transmission electron microscope observation, leaves the protoenstatite unchanged. Therefore, samples including protoenstatite should be prepared without producing shear stress so that the protoenstatite can be observed.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 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