THE PYROPHANITE ECANDREWSITE SOLID-SOLUTION: CRYSTAL STRUCTURES OF THE Mn1 xZnxTiO3 SERIES (0.1 <= x <= 0.8)
Bibliographic record
Abstract
Nous avons determine la structure cristalline de membres de la solution solide pyrophanite-ecandrewsite, Mn 1 - x Zn x TiO 3 (0.1 ≤ x ≤ ≤ 0.8 apfu), synthetisee selon des methodes ceramiques dans l'air a pression ambiante, par affinement de Rietveld de donnees obtenues par diffraction X sur poudres. Tous ces composes cristallisent avec la structure de l'ilmenite et adoptent donc le groupe spatial R3. La solubilite maximum de Zn dans le MnTiO 3 serait environ 0.8 apfu Zn, parce que des composes ayant une teneur plus elevee de Zn ne se sont pas formes. Nous fournissons les donnees requises pour decrire les parametres reticulaires, les coordonnees des atomes, les longueurs des liaisons, et les volumes et les indices de distorsion de tous les polyedres de coordinence. Dans la solution solide, les parametres reticulaires et les volumes de la maille elementaire diminuent de facon lineaire a partir de ceux de MnTiO 3 a mesure que la proportion de ZnTiO 3 augmente. Tous ces composes contiennent des polyedres de coordinence AO 6 et TiO 6 difformes; tout comme pour la pyrophanite et l'ilmenite, le polyedre AO 6 est le plus difforme des deux. Le deplacement de (Mn,Zn) et de Ti des centres des polyedres de coordinence augmente avec l'augmentation de la proportion du Zn. La distance intercouche traversant la lacune dans le site octaedrique de la couche d'octaedres TiO 6 diminue a mesure que le Zn entre dans le site A des octaedres AO 6 . Les titanates synthetiques sont les analogues de l'ecandrewsite manganifere depourvue de fer et de la pyrophanite zincifere que nous retrouvons dans les syenites hyperalcalines a Pilansberg, en Afrique du Sud, et a Pocos de Caldas, au Bresil.
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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) | 0.002 | 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".