A structural phase transition in the intermetallic compound Tm<sub>3</sub>Cu<sub>4</sub>Sn<sub>4</sub>
Bibliographic record
Abstract
The ternary intermetallic system R 3 T 4 X 4 (where R = rare earth; T= Mn, Cu, Ag, Au, Pd; X=Si, Ge, Sn) comprises an extensive series of isostructural compounds that form in the orthorhombic Gd 3 Cu 4 Ge 4 -type structure (space group Immm , #71). The exceptions to this generic structure are Tm 3 Cu 4 Sn 4 and Lu 3 Cu 4 Sn 4 which have a monoclinic structure (space group C 12/ m 1, #12) at room temperature. Here, we report a structural phase transition in Tm 3 Cu 4 Sn 4 from monoclinic C 12/ m 1 to orthorhombic Immm upon heating above room temperature. We have carried out X-ray powder diffraction and differential scanning calorimetry on Tm 3 Cu 4 Sn 4 and we observe the structural transition at 458(2) K.
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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".