RECRYSTALLIZATION OF METAMICT Nb Ta Ti REE COMPLEX OXIDES: A COUPLED X-RAY-DIFFRACTION AND RAMAN SPECTROSCOPY STUDY OF AESCHYNITE-(Y) AND POLYCRASE-(Y)
Bibliographic record
Abstract
Nous avons etudie l'aeschynite-(Y) et le polycrase-(Y) metamictes par diffraction X et par spectroscopie de Raman. Afin de retablir leur structure originelle, ces echantillons ont ete chauffes a divers paliers de temperature. Les temperatures 400, 500, 650, 800 et 1000°C semblent, d'apres les traces thermogravimetriques et thermiques differentiels, etre des etapes importantes dans la restauration ou le changement des structures, qui correspondent en general aux donnees deja disponibles. Nous nous sommes servis de la spectroscopie de Raman pour decouvrir des bandes de vibration possiblement caracteristiques des mineraux metamictes etudies. Les changements de vibration dans ces spectres sont dus au rechauffement, mais revelent aussi des effets possibles sur la structure non observables par rayons X. Les donnees en diffraction X et les spectres de Raman indiquent une augmentation graduelle de la cristallinite a mesure qu'augmente la temperature. Nous observons une transformation de la structure de l'aeschynite a celle de l'euxenite dans les deux mineraux, mais en chauffant jusqu'a 1000°C, elle est incomplete pour l'aeschynite-(Y) et complete pour le polycrase-(Y). Les spectres de Raman des deux mineraux sont semblables, reflexion de leur ressemblance chimique aussi bien que structurale, mais les differences observees dependraient surtout de la facon dont les polyeedres de coordinence sont empiles. Ces differences sont le plus prononcees dans l'intervalle de frequence entre 200 et 550 cm - 1 , qui semble approprie pour reconnaitre les phases minerales ayant la structure de l'aeschynite ou de l'euxenite.
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How this classification was reachedexpand
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".