Structure and complex twinning of dysprosium disilicate (Dy<sub>2</sub>Si<sub>2</sub>O<sub>7</sub>), Type B
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Bibliographic record
Abstract
Dysprosium disilicate (Dy(2)Si(2)O(7)) is triclinic with a = 6.6158 (2), b = 6.6604 (2), c = 12.0551 (4) A, alpha = 94.373 (2), beta = 90.836 (2), gamma = 91.512 (2) degrees, V = 529.4 (1) A(3), space group P1;, Z = 4 and D(x) = 6.156 g cm(-3). The structure (single-crystal X-ray, R = 0.033, wR = 0.041) is built from a linear triple tetrahedral group [Si(3)O(10)] and isolated [SiO(4)] tetrahedron cross-linked by Dy(3+) in one sixfold and three eightfold coordinated positions, and corresponds to the presently revised type B structure of Ho(2)Si(2)O(7). The formation of the unusual linear triple tetrahedral group in the type B structure allows for a more continuous transition in the mean size of REE(3+)O(n) (REE = rare earth element) polyhedra in REE disilicates through the 4f transition metal series. The crystal of Dy(2)Si(2)O(7) investigated was complexly twinned such that the diffraction pattern was also consistent with a larger dimensionally monoclinic unit cell (a = 22.5354, b = 14.2102, c = 6.6158 A, beta = 91.788 degrees ), which resulted in an apparent superstructure of the type B structure in space group C1;. Lattice coincidence with the type B unit cell appears to have been maintained during crystal synthesis and quenching by the complex sector-zoned growth twin.
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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) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.002 | 0.004 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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