A SINGLE-CRYSTAL NEUTRON-DIFFRACTION INVESTIGATION OF SPODUMENE AT 54 K
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Bibliographic record
Abstract
A single-crystal investigation of spodumene from a granitic pegmatite in Minas Gerais, Brazil, was undertaken using neutron (54 K) and X-ray diffraction (room temperature) (R all = 2.8% and 1.9%, respectively). In both refinements, space group C2/c was assigned; the presence of several reflections violating the c glide plane in the low-temperature neutron-diffraction data set is attributed to multiple scattering. An asymmetric density of scattering at the Li site was observed in both refinements, and is related to dynamic disorder. In spodumene, a C2/c fully relaxed low-temperature structure is therefore present, in contrast to LiCrSi2O6, LiFeSi2O6, and LiGaSi2O6 pyroxenes, for which it is P21/c. The main geometrical difference between spodumene and LiFeSi2O6 is the flexibility with temperature of the chain of S-rotated tetrahedra in spodumene. It enables spodumene to cope with the variation in octahedron size, in comparison with the stiffness of the completely extended chain of tetrahedra in LiFeS i2O6.
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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) | 0.001 | 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 it