Unit-cell parameters for scapolite solid solutions and a discontinuity at <i>Me</i> <sub>75</sub> , ideally NaCa <sub>3</sub> [Al <sub>5</sub> Si <sub>7</sub> O <sub>24</sub> ](CO <sub>3</sub> )
Why this work is in the frame
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Bibliographic record
Abstract
Twenty-seven scapolite samples from various localities and with compositions between Me 6–93 were obtained using electron microprobe analysis (EMPA). Their unit-cell parameters were obtained using synchrotron high-resolution powder X-ray diffraction (HRPXRD) data and Rietveld structure refinements using space group P 4 2 / n . The EMPA data show the well-known discontinuity at Me 75 . In addition, the unit-cell parameters, especially c , show a discontinuity at Me 75 (=five Al atoms per formula unit, apfu ), ideally NaCa 3 [Al 5 Si 7 O 24 ](CO 3 ), where the scapolite solid solution is divided into two ( Me % = [Ca/(Ca + Na + K)] × 100). A maximum c parameter value occurs at Me 37.5 (=four Al apfu ideally), where complete Al–Si, Na–Ca, and Cl–CO 3 order occurs. The unit-cell volume, V , varies smoothly with Me % and Al apfu across the series.
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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 | 0.004 | 0.002 |
| Meta-epidemiology (narrow) | 0.004 | 0.005 |
| Meta-epidemiology (broad) | 0.004 | 0.003 |
| Bibliometrics | 0.003 | 0.003 |
| Science and technology studies | 0.005 | 0.003 |
| Scholarly communication | 0.003 | 0.009 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.003 | 0.004 |
| Insufficient payload (model declined to judge) | 0.000 | 0.003 |
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