Cation Exchange in Lanthanide Fluoride Nanoparticles
Why this work is in the frame
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Bibliographic record
Abstract
Cation exchange in lanthanide fluoride nanoparticles is reported. Typically, dispersible LnF(3) nanoparticles were exposed to another lanthanide ion that was roughly 5 times the amount of Ln(3+) in the nanoparticles. Results show that cation exchange of GdF(3) nanoparticles with La(3+) was almost complete in 1 min, and it also happens reversibly although the degree of exchange is not as much as the forward reaction. However, cation exchange with lanthanide ions close to each other, such as GdF(3) with Eu(3+) and NdF(3) with La(3+), did not end up with nearly full exchange, but with a significant amount of the two lanthanides. A relatively small driving force for the cation exchange is suggested by the experimental results, which is also confirmed by calculations based on a thermodynamic cycle. This unprecedented finding in the field of lanthanide-based nanoparticles raises the question whether reported core-shell structures were indeed made and, at the same time, it opens up new pathways to make nanomaterials that cannot be made directly.
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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) | 0.000 | 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) | 0.000 | 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 it