Rare-Earth Manganese Copper Pnictides RE<sub>2</sub>Mn<sub>3</sub>Cu<sub>9</sub>Pn<sub>7</sub> (Pn = P, As): Quaternary Ordered Variants of the Zr<sub>2</sub>Fe<sub>12</sub>P<sub>7</sub>-Type Structure
Bibliographic record
Abstract
The pnictides RE(2)Mn(3)Cu(9)Pn(7) (Pn = P, As) have been prepared by stoichiometric reaction of the elements at 800 °C. They are quaternary ordered variants of the hexagonal Zr(2)Fe(12)P(7)-type structure (Pearson symbol hP21, space group P6, Z = 1; a = 9.6444(3)-9.5970(7) Å, c = 3.9027(1)-3.7761(3) Å for RE(2)Mn(3)Cu(9)P(7) (RE = La-Nd, Sm, Gd-Dy); a = 9.9376(6)-9.9130(3) Å, c = 4.0194(2)-3.9611(1) Å for RE(2)Mn(3)Cu(9)As(7) (RE = La-Nd)). Of the four possible sites available for the transition metal, the square pyramidal site (CN5) is occupied preferentially by Mn atoms, whereas the three tetrahedral sites (CN4) are occupied by Cu atoms. On proceeding to smaller RE members in the RE(2)Mn(3)Cu(9)Pn(7) series, one of the transition-metal-centered polyhedra (Cu1) tends to become less distorted, while the remaining three (Cu2, Cu3, Mn4) become more distorted. Band structure calculations on La(2)Mn(3)Cu(9)P(7) confirm that Mn-P and Cu-P contacts provide the strongest bonding interactions. Electrical resistivity measurements on Ce(2)Mn(3)Cu(9)P(7) reveal metallic behavior with transitions at 165 and 18 K, probably of magnetic origin.
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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 | 0.004 | 0.004 |
| Meta-epidemiology (narrow) | 0.006 | 0.005 |
| Meta-epidemiology (broad) | 0.005 | 0.002 |
| Bibliometrics | 0.001 | 0.005 |
| Science and technology studies | 0.003 | 0.004 |
| Scholarly communication | 0.002 | 0.004 |
| Open science | 0.009 | 0.005 |
| Research integrity | 0.005 | 0.007 |
| Insufficient payload (model declined to judge) | 0.002 | 0.006 |
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".