New Quaternary Barium Copper/Silver Selenostannates: Different Coordination Spheres, Metal−Metal Interactions, and Physical Properties
Why this work is in the frame
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Bibliographic record
Abstract
BaAg 2 SnSe 4, BaCu 2 SnSe 4, and Ba 3 Cu 2 Sn 3 Se 10 were prepared by directly reacting the elements in stoichiometric ratios at 800 °C, followed by long heating between 600 and 650 °C. BaAg 2 SnSe 4 crystallizes in the BaAg 2 SnS 4 type, space group I 222, BaCu 2 SnSe 4 in the SrCu 2 GeSe 4 type, space group Ama 2, and Ba 3 Cu 2 Sn 3 Se 10 in a new structure type, space group P 2 1 / n . All three structures comprise almost undistorted SnSe 4 tetrahedra and pairs of the group 11 elements (M = Cu and Ag). While both the M atoms are bonded to four Se atoms in each case, the deviations from an MSe 4 tetrahedron are severe, and distinctly different within this series. BaAg 2 SnSe 4, BaCu 2 SnSe 4, and Ba 3 Cu 2 Sn 3 Se 10 are black semiconductors, with computed band gaps of 0.2, 0.7, and 1.2 eV, respectively. The experimental gaps for the former two are 0.24 and 0.48 eV, respectively. The electrical conductivities consistently decrease with increasing band gap.
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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 | 0.000 | 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 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.008 | 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