Sb<sub>2</sub>(TeO<sub>4</sub>)(SO<sub>4</sub>): An Anhydrous Tellurite Sulfate with Large Birefringence and Enhanced Thermal Stability
Bibliographic record
Abstract
The birefringence of birefringent materials is positively correlated with structural anisotropy. By introducing 5 s 2 -electron-containing Sb 3+ and Te 4+ cations into a sulfate system, the anhydrous antimony tellurite sulfate Sb 2 (TeO 4 )(SO 4 ) was obtained. Due to the stereochemically active lone pairs (SCALPs), both Sb 3+ and Te 4+ cations are four-coordinated with O atoms to form the distorted seesaw-shaped units. Benefiting from the strong polarizability anisotropy of the distorted polyhedra, Sb 2 (TeO 4 )(SO 4 ) exhibits a large birefringence, as well as wide transparency range and high thermal stability, making the compound a potential UV birefringent material. Structural and theoretical calculations indicate that the optical properties mainly originate from the highly distorted SO 4 and TeO 4 units and their uniform alignment. This work will provide some useful insights into the development of SCALP-cation-based birefringent crystals.
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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".