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 R3T4X4 (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 Gd3Cu4Ge4-type structure (space group Immm, #71). The exceptions to this generic structure are Tm3Cu4Sn4 and Lu3Cu4Sn4 which have a monoclinic structure (space group C12/m1, #12) at room temperature. Here, we report a structural phase transition in Tm3Cu4Sn4 from monoclinic C12/m1 to orthorhombic Immm upon heating above room temperature. We have carried out X-ray powder diffraction and differential scanning calorimetry on Tm3Cu4Sn4 and we observe the structural transition at 458(2) K.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.002 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".