Magnetic phase diagram of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Ce</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Fe</mml:mi><mml:mn>17</mml:mn></mml:msub></mml:mrow></mml:math>
Bibliographic record
Abstract
Rare-earth-based permanent-magnet materials rich in iron have relatively low ferromagnetic ordering temperatures. This is believed to be due to the presence of antiferromagnetic exchange interactions, besides the ferromagnetic interactions responsible for the magnetic order. The magnetic properties of ${\mathrm{Ce}}_{2}{\mathrm{Fe}}_{17}$ are anomalous. Instead of ferromagnetic, it is antiferromagnetic, and instead of one ordering temperature, it shows two, at the N\'eel temperature ${T}_{N}\ensuremath{\sim}208\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and at ${T}_{t}\ensuremath{\sim}124\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. ${\mathrm{Ce}}_{2}{\mathrm{Fe}}_{17}$, doped by 0.5% Ta, also shows two ordering temperatures, one to an antiferromagnetic phase, at ${T}_{N}\ensuremath{\sim}214\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, and one to a ferromagnetic phase, at ${T}_{0}\ensuremath{\sim}75\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. In order to clarify this behavior, single-crystalline samples were prepared by solution growth and characterized by electron microscopy, single-crystal x-ray diffraction, temperature-dependent specific heat, and magnetic field and temperature-dependent electrical resistivity and magnetization. From these measurements, magnetic $H\text{\ensuremath{-}}T$ phase diagrams were determined for both Ta-doped ${\mathrm{Ce}}_{2}{\mathrm{Fe}}_{17}$ and undoped ${\mathrm{Ce}}_{2}{\mathrm{Fe}}_{17}$. These phase diagrams can be very well described in terms of a theory that gives magnetic phase diagrams of systems with competing antiferro- and ferromagnetism.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.059 | 0.004 |
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".