Structural, Mössbauer, and transport studies of the icosahedral quasicrystals Al<sub>55</sub>Si<sub>7</sub>Cu<sub>25.5</sub>Fe<sub>12.5</sub>, Al<sub>62.5</sub>Cu<sub>24.5</sub>Fe<sub>13</sub>and the crystalline 1/1 approximant Al<sub>55</sub>Si<sub>7</sub>Cu<sub>25.5</sub>Fe<sub>12.5</sub>
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Bibliographic record
Abstract
As-quenched icosahedral Al55Si7Cu25.5Fe12.5, its 1/1 approximant of the same composition, and icosahedral Al62.5Cu24.5Fe13 alloys have been studied using x-ray diffraction, scanning transmission electron microscopy and the high-angle annular dark field technique, zero-field and in-field 57Fe Mössbauer spectroscopy, and electrical resistivity. The crystal structure of the 1/1 approximant Al55Si7Cu25.5Fe12.5 has been refined with the Rietveld method and shown to be compatible with the measured high-angle annular dark field images. The distribution of the principal component of the electric field gradient tensor has a bimodal character with a dominant negative sign in the icosahedral Al–Cu–Fe system. The local order of the Fe structural environment is compared in icosahedral Al55Si7Cu25.5Fe12.5, its 1/1 approximant, and icosahedral Al62.5Cu24.5Fe13. The average quadrupole splitting decreases with temperature as T3/2 for all alloys studied, and its value is significantly larger for the icosahedral alloys. The vibrations of the Fe atoms in the alloys studied are well described by a Debye model, with characteristic Mössbauer temperatures of 468(25), 487(19), and 455(6) K for icosahedral Al55Si7Cu25.5Fe12.5, its 1/1 approximant, and icosahedral Al62.5Cu24.5Fe13, respectively. The electrical resistivity is discussed in terms of quantum interference effects and structural disorder.
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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 | 0.012 | 0.002 |
| Meta-epidemiology (narrow) | 0.013 | 0.011 |
| Meta-epidemiology (broad) | 0.016 | 0.008 |
| Bibliometrics | 0.004 | 0.007 |
| Science and technology studies | 0.008 | 0.013 |
| Scholarly communication | 0.005 | 0.009 |
| Open science | 0.009 | 0.005 |
| Research integrity | 0.005 | 0.013 |
| Insufficient payload (model declined to judge) | 0.000 | 0.001 |
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 it