Electronic Structure and Physical Properties of the Semiconducting Polytelluride Ba<sub>2</sub>SnTe<sub>5</sub> with a Unique Te<sub>5</sub><sup>4-</sup> Unit
Bibliographic record
Abstract
A new modification of Ba 2 SnTe 5 was prepared by directly reacting the elements in stoichiometric ratios at 750 °C, while the first reported modification was formed in a potassium polytelluride flux at 450 °C. The former crystallizes in a unique structure type with SnTe 4 tetrahedra, SnTe 5 trigonal bipyramids, and nonlinear Te 5 4- units, space group P 2 1 / c, with lattice dimensions of a = 9.6791(5) Å, b = 13.1696(7) Å, c = 27.5957(15) Å, V = 3516.3(3) Å 3, β = 91.585(1)° ( Z = 12), while the earlier reported bronze-colored Ba 2 SnTe 5 (orthorhombic, space group Pnma ) is comprised of SnTe 4 tetrahedra and dimeric Te 2 2- units. The new, black Ba 2 SnTe 5 is a small band gap semiconductor, as predicted via electronic structure calculations and as verified by Seebeck coefficient and electrical conductivity measurements.
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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) | 0.002 | 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".