High-Temperature Order−Disorder Transition in CoCr<sub>2</sub>Se<sub>4</sub>and Trapping Co Disorder in Monoclinic CoCr<sub>2</sub>Se<sub>4</sub>: Structural Features of Cu<sub>1−<i>x</i></sub>Co<sub><i>x</i></sub>Cr<sub>2</sub>Se<sub>4</sub>Phases
Bibliographic record
Abstract
X-ray diffraction studies on the Cu(1-x)Co(x)Cr(2)Se(4) system (x = 0, 0.2, 0.4, 0.6, 0.8, 1) proved the existence of the cubic spinel-type structure for x < or = 0.2 and the monoclinic Cr(3)S(4)-type one for x > or = 0.8. CoCr(2)Se(4) undergoes an order-disorder phase transition above 750 degrees C. The high-temperature CoCr(2)Se(4) polymorph crystallizes in the filled GdI(2)-type structure with the P3m1 space group. The trigonal-to-monoclinic symmetry breaking in CoCr(2)Se(4) is found to be first-order within Landau theory. Co distribution in the low-temperature monoclinic CoCr(2)Se(4) structure depends on cooling conditions of trigonal CoCr(2)Se(4): rapid quenching results in Co disorder in the monoclinic structure, while slow cooling yields a fully ordered monoclinic structure.
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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".