Bibliographic record
Abstract
Magnetocaloric compound Gd5Si4 has a higher Curie temperature TC=336K than that of Gd pure metal (TC=294K). High temperature synchrotron x-ray powder diffraction experiments have been performed for Gd5Si4 from 300to400K. Rietveld fitting of the results indicate that the compound retains the orthorhombic Gd5Si4-type structure with a space group of Pnma in the above temperature range, where the unit cell is composed of two well defined Gd–Si slabs connected to each other by Si–Si bonds along the b axis. The unit cell volume expands almost linearly with increasing temperature below and above TC. However, the lattice thermal expansion is anisotropic and discontinuous around TC. The lattice constants change from a=7.4834(1)Å, b=14.7476(3)Å, and c=7.7493(2)toa=7.4846(2)Å, b=14.7452(4)Å, and c=7.7560(1) as the temperature is increased from 325to345K. b contracts by about 0.02% while c expands by about 0.08%. Electronic structure calculations show that the anisotropic lattice expansion near TC changes the valence electron distribution between Gd and Si and thus to the Ruderman-Kittel-Kasuya-Yosida interaction, which affects the magnetic ordering and the magnetic transition in Gd5Si4.
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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) | 0.001 | 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".