Structure and complex twinning of dysprosium disilicate (Dy<sub>2</sub>Si<sub>2</sub>O<sub>7</sub>), Type B
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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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".