Produit de solubilité apparent de la fluorapatite frittée
Bibliographic record
Abstract
Abstract Solubility of sintered fluorapatite . The apparent solubility of fluorapatite (Fap) sintered at 890°C for one hour under an argon atmosphere was determined at 25, 30, 37 and 50°C in dilute solutions of phosphoric acid of various concentrations. The Fap displayed retrograde solubility. When the concentration of H 3 PO 4 was below 20.10 −3 mol/L, infrared spectroscopy and X-ray diffraction patterns did not show any significant evolution of the solid after equilibration. For a concentration of 50. 10 −3 mol/L, the apatite phase was modified with formation of calcium fluoride and of an amorphous phosphated phase CaHP0 4 . Scanning electron microscopy showed a grain growth when temperature increased. The evolution towards new phases was assigned to secondary reactions and to the surface effect of the solid particles. Le produit de solubilite apparent de la fluorapatite (Fap), frittee a 890°C pendant une heure sous atmosphere d'argon, a ete determine a 25, 30, 37 et 50°C, dans des solutions diluees d'acide phosphorique de concentration variant de 5.10 −3 a 50.10 −3 mol/L. Les resultats obtenue montrent que la Fap frittee presente une solubilite retrograde. L'analyse par spectroscopie infrarouge et diffraction des rayons X du solide en equilibre avec la solution montre que celui-ci ne subit pas d'evolution significative jusqu'a la concentration en H 3 PO 4 de 20.10 −3 mol/L. Pour la concentration de 50.10 −3 mol/L, on note une modification de la phase apatitique avec formation de fluorine et d'une phase phosphatee amorphe CaHP0 4 . L'examen par microscopie electronique a balayage a permis de mettre en evidence un grossissement des grains en fonction de la temperature. L'evolution de l'apatite a ete attribuee a des reactions secondaires faisant intervenir les entites chimiques en solution, et a l'effet de surface des particules solides.
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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".