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
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.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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".