Dynamics of Ag<sup>+</sup> Ions in RbAg<sub>4</sub>I<sub>5</sub> Probed Indirectly via <sup>87</sup>Rb Solid-State NMR
Bibliographic record
Abstract
Solid-state 87 Rb NMR has been used to determine the ionic hopping rate of Ag + ions in a powdered sample of α-RbAg 4 I 5 as a function of temperature from 20 to 250 °C. In this phase, Rb is a stationary framework atom, which does not take part in ionic conduction in this material. At the same time 87 Rb has a large quadrupole moment, making 87 Rb NMR capable of detecting mobile species in close proximity. Simulation of the static 87 Rb NMR powder pattern under the influence of Ag + motion was performed using the EXPRESS software. Lineshape simulations were used to extract an ionic hopping rate for each temperature, and changes in the line shape were correlated to changes in ion mobility, which increases with temperature. Ag + hopping rates were found to be in the range of 7.0 ± 0.5 kHz to 30 ± 2 kHz within the temperature window of 20 to 100 °C, resulting in an activation energy of 17 ± 3 kJ/mol (0.18 ± 0.03 eV), for silver ion hopping. This result is in agreement with previous studies, suggesting that this indirect method of detecting ion mobility can be extended to other ion conducting materials.
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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".