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 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 | 0.001 | 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) | 0.000 | 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 teacher head, 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".