Anharmonicity-induced glasslike transition in a plastic crystal without α relaxation
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Bibliographic record
Abstract
In the low-temperature crystal phase of ${\mathrm{TlNO}}_{2}$ studied by dielectric spectroscopy (10 mHz to 3 GHz), the \ensuremath{\alpha}-relaxation process does not evolve, and the molecular dynamics is controlled only by one relaxation process with Arrhenius energy of 19.8 kJ ${\mathrm{mol}}^{\mathrm{\ensuremath{-}}1}$. Its characteristic time is comparable to the measurement time scale at \ensuremath{\sim}62 K, where its ${C}_{p},$ the expansivity \ensuremath{\alpha}, and the T derivative of the mean-square atomic displacement decrease in a manner similar to that on the dynamic freezing of the \ensuremath{\alpha} process. However, neutron powder diffraction measurements show no evidence for two-site occupancy or orientational disordering [Phys. Rev. B 57, 11 125 (1998)]. We propose a nonconfigurational mechanism for this dynamics, namely, that when a vacancy appears at a Tl site, the anharmonicity of librations of the ${\mathrm{NO}}_{2}^{\ensuremath{-}}$ ion increases, which changes the mean dipole vector and raises ${C}_{p}$ and \ensuremath{\alpha}. When the vacancy diffusion does not occur during the measurement period, the anharmonic contribution vanishes and ${C}_{p}$ and \ensuremath{\alpha} decrease.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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) | 0.006 | 0.002 |
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