SYNTHESIS AND PROPERTIES OF V3+ ANALOGUES OF JAROSITE-GROUP MINERALS
Bibliographic record
Abstract
Nous avons synthetise les composes analogues de la natrojarosite, jarosite, jarosite substituee par le rubidium, dorallcharite, hydronium jarosite, ammoniojarosite et plumbojarosite contenant du V 3 + en utilisantune demarche conventionnelle d'hydrolyse, Quoiqu'une temperature de 100°C est acceptable pour la plupart des syntheses, nous avons eu besoin de chauffer a 140°C pour obtenir une quantite suffisante de l'analogue a V 3 + de la hydronium jarosite. De plus, l'analogue a V 3 + de la plumbojarosite a ete synthetise par reaction d'un excedent de PbSO 4 a 150°C, avec dissolution par la suite du PbSO 4 non reagi a temperature ambiante avec une solution d'acetate d'ammonium. Nos efforts pour synthetiser l'analogue a V 3 + de l'argentojarosite n'ont pas reussi, parce que le vanadium trivalent a reduit l'ion Ag + a l'argent metallique. Les analogues vanadiferes (V 3 + ) des mineraux du groupe de la jarosite se presentent en general en aggregats spheroides faits de cristaux individuels atteignant 3 μm de diametre. Selon les donnees de diffraction X, methode des poudres, tous les precipites adoptent la structure R3m des mineraux de ce groupe; toutefois, aucun signe d'une reflexion a ∼11 A n'a ete decele dans l'analogue vanadifere de la plumbojarosite, ce qui temoigne d'un manque d'ordre impliquant les ions Pb 2 + et les lacunes associees. Nous avons aussi mesure la densite de ces analogues a V 3 + ; les valeurs sont relativement faibles a cause des lacunes dans le site V des structures.
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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".