Physical properties of the icosahedral quasicrystal Al<sub>60</sub>Cr<sub>19.9</sub>Fe<sub>0.1</sub>Ge<sub>20</sub>
Bibliographic record
Abstract
The results of x-ray diffraction, 57 Fe Mössbauer spectroscopy, magnetic susceptibility, and electrical conductivity studies of the metastable icosahedral alloy Al 60 Cr 19.9 Fe 0.1 Ge 20 are reported. The observed broadening of the diffraction Bragg peaks reflects the presence of the topological/chemical disorder. The distribution of the electric quadrupole splitting derived from Mössbauer spectra indicates the existence of a multiplicity of Fe sites. The average quadrupole splitting decreases with temperature as T 3/2 . The vibrations of the Fe atoms are well described by a Debye model, with the Debye temperature of 463(15) K. The temperature dependence of the magnetic susceptibility follows the Curie–Weiss law with the effective magnetic moment of 0.312(3) μ B per Cr/Fe atom. The origin of the presence of the magnetic moment, and its absence in similar crystalline alloys, is discussed. The temperature dependence of the electrical conductivity can be successfully fitted with the use of theories of quantum interference effects, and values for spin–orbit and inelastic scattering times are extracted from the fits. The scattering process in the studied quasicrystal is dominated by inelastic electron–electron scattering.
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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) | 0.002 | 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".