From Yellow to Black: New Semiconducting Ba Chalcogeno-Germanates
Bibliographic record
Abstract
The new germanates Ba 2 GeSe 4−δ Te δ (δ < 2.5) were prepared by reacting the elements under exclusion of air at 800°C, followed by slow cooling to room temperature. These germanates form the Sr 2 GeS 4 type, monoclinic space group P2 1 /m, with lattice dimensions of a = 699.58(4), b = 709.38(4), c = 917.38(6) pm, β = 109.135(1)◦, V = 430.11(4) ・ 10 6 pm 3 (Z = 2) for Ba 2 GeSe 4 . The structure contains isolated GeSe 4 tetrahedra. The oxidation states are assigned to be Ba II , Ge IV , and Se −II . The yellow color of this ortho-seleno-germanate is indicative of semiconducting behavior with an activation energy of 2.6 - 3.0 eV, and the black appearance of the seleno-telluro-germanates points towards gaps < 1.7 eV. Electronic structure calculations based on the LMTO approximation resulted in smaller gaps of 1.7 - 0.8 eV, a tendency that is typical for this calculation method.
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How this classification was reachedexpand
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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.003 |
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; both teacher heads agree on what is shown here.
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".