Anharmonicity-induced glasslike transition in a plastic crystal without α relaxation
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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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".