AlFe<sub>2–<i>x</i></sub>Co<sub><i>x</i></sub>B<sub>2</sub> (<i>x</i> = 0–0.30): <i>T</i><sub>C</sub> Tuning through Co Substitution for a Promising Magnetocaloric Material Realized by Spark Plasma Sintering
Why this work is in the frame
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Bibliographic record
Abstract
AlFe 2 B 2 and AlFe 2– x Co x B 2 ( x = 0–0.30) were synthesized from the elements in three different ways. The samples were characterized by powder X-ray diffraction, Rietveld refinements, energy-dispersive X-ray spectroscopy, and magnetic measurements. Using Al flux the formation of AlFe 2 B 2 single crystals is preferred. Arc melting enables the substitution of ∼6% Co. This substitution of Fe by Co decreases the Curie temperature T C from 290 to 240 K. The highest Co substitution up to 15% is achieved by spark plasma sintering (SPS). T C is reduced to 205 K. In all cases an excess of Al is necessary to avoid the formation of ferromagnetic FeB. Al 13 Fe 4– x Co x is the common byproduct. T C and the cobalt content are linearly correlated. The transition paramagnetic–ferromagnetic remains sharp for all examples. The magnetic entropy change of the Co-containing samples is comparable to AlFe 2 B 2 . SPS synthesis yields, in short reaction times, a homogeneous and dense material with small amounts of paramagnetic Al 13 Fe 4–x Co x as an impurity, which can serve as sinter additive. These properties make AlFe 2– x Co x B 2 a promising magnetocaloric material for applications between room temperature and 200 K.
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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 | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.002 | 0.002 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.001 |
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 it