THE CRYSTAL CHEMISTRY, STRUCTURE AND PROPERTIES OF A SYNTHETIC CARNOTITE-TYPE COMPOUND, Ba2[(UO2)2Ti2O8]
Bibliographic record
Abstract
Nous avons determine la structure cristalline d'un compose de type carnotite, Ba 2 [(UO 2 ) 2 Ti 2 O 8 ], par methodes ab initio a partir de donnees de diffraction X (rayonnement synchrotron) et diffraction de neutrons. Nous decrivons pour la premiere fois la structure d'un titanate uranyle; elle a ete resolue dans le groupe spatial P2 1 /c, systeme monoclinique, avec les parametres reticulaires a 6.4463(1), b 8.5999(1), c 10.2532(1) A, p 75.936(1)°, V 551.36(1) A 3 , D calc 6.253 g/cm 3 et Z = 4. Des histogrammes multiples ont ete utilises pour affiner la structure a partir des donnees obtenues avec rayonnement synchrotron et diffraction de neutrons, ce qui a donne les valeurs suivantes des indices de qualite: R B 0.032 et 0.039, R wp 0.090 et 0.063, et Rp 0.070 et 0.049, respectivement. Le compose a une structure en couches, dans lesquelles les bipyramides uranylees pentagonales partagent des aretes avec les pyramides carrees TiO 5 . Ces feuillets sont separes par des feuillets d'atomes de barium a coordinence 11. Vue la possibilite d'utiliser le compose Ba 2 [(UO 2 ) 2 T 2 O 8 ] comme materiau ceramique pour l'immobilisation de dechets radioactifs, nous avons determine le taux de lessivage de l'uranium et du barium. Les taux de lessivage du compose Ba 2 [(UO 2 ) 2 Ti 2 O 8 ], normalises sur sept jours, sont 1.3 X 10 -5 g/m 2 /jour pour l'uranium, ce qui est sensiblement plus faible que les taux observes avec un materiau a structure de pyrochlore, et 1 X 10 -4 g/m 2 /jour pour le barium.
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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 | 0.001 | 0.001 |
| 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".