Band Gap Tuning in New Strontium Seleno-Stannates
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Bibliographic record
Abstract
The new ternary seleno-stannates Sr 2 SnSe 5 and SrSn 2 Se 4 were both prepared from directly reacting the elements in stoichiometric ratios at 850 °C, followed by slow cooling. Sr 2 SnSe 5 crystallizes in the Eu 2 SnSe 5 type with Sn IV, Se - II, and nonlinear Se 3 2 - units, space group P 2 1 2 1 2, with lattice dimensions of a = 1205.7(2) pm, b = 1658.3(3) pm, c = 863.9(2) pm, V = 1.7272(6) nm 3 ( Z = 8). SrSn 2 Se 4 forms a distorted variant of the SrIn 2 Se 4 type with mixed valences, i.e., Sn II and Sn IV instead of two In III . The distortion is reflected in lowering the symmetry from Fddd to Fdd 2, occurring with differently sized and distorted Sn II Se 4 and Sn IV Se 4 tetrahedra. The lattice dimensions are a = 2189.2(1) pm, b = 2189.3(1) pm, c = 1354.70(7) pm, V = 6.4928(6) nm 3 ( Z = 32). The Sn II atoms may be replaced by Mg, producing the new isostructural compound SrMgSnSe 4 with a = 2176.0(1) pm, b = 2185.9(1) pm, c = 1340.60(9) pm, V = 6.3765(7) nm 3 . SrMgSnSe 4 is a red material (indicative of a band gap of 2.0 eV), while the two other seleno-stannates are black, pointing toward gaps <1.7 eV. The computed band gaps are 1.8 eV for SrMgSnSe 4, 0.9 eV for Sr 2 SnSe 5, and 0.2 eV for SrSn 2 Se 4 .
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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 | 0.000 |
| 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 it