Rare‐Earth Tetrel Antimonides <i>RE</i><sub>5</sub><i>Tt<sub>x</sub></i>Sb<sub>3–<i>x</i></sub> (<i>RE</i> = La–Nd; <i>Tt</i> = Si, Ge)
Bibliographic record
Abstract
Abstract Ternary rare‐earth tetrel antimonides RE5TtxSb3–x (RE = La–Nd; Tt = Si, Ge) have been prepared by arc‐melting of the elements and annealing at 800 °C. Their crystal structures were determined by single‐crystal and powder X‐ray diffraction methods. These ternary antimonides adopt a structure (β‐Yb5Sb3‐type, orthorhombic, space group Pnma, Z = 4) that is different from those of the parent binary phases RE5Sb3 (Mn5Si3‐type), RE5Si3 (Cr5B3‐type), or RE5Ge3 (Mn5Si3‐type) for RE = La–Nd. The range of solid solubility determined for a representative series, La5GexSb3–x, is relatively wide, 0.9 ≤ x ≤ 1.6. The disorder arises largely from the partial substitution of Tt atoms into Sb sites centred within RE6 trigonal prisms. Columns of confacial RE6 trigonal prisms are connected to each other through edge‐sharing to form a three‐dimensional framework outlining hexagonal channels filled by ribbons of [RE2Tt2] rhombs. Band‐structure calculations provided support for these site preferences and the range of solid solubility in La5GexSb3–x, which can be related largely to changes in the heteroatomic La–Ge and La–Sb bonding interactions. Magnetic measurements on RE5TtxSb3–x (RE = La, Pr, Nd) revealed Pauli paramagnetic behaviour for the La members and multiple low‐temperature transitions (likely involving ferromagnetic ordering) for the Pr and Nd members. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
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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) | 0.002 | 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".