THE CRYSTAL CHEMISTRY OF URANYL MOLYBDATES. II. THE CRYSTAL STRUCTURE OF IRIGINITE
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Bibliographic record
Abstract
The structure of synthetic iriginite, [(UO 2 )Mo 2 O 7 (H 2 O) 2 ](H 2 O), a 6.705(1), b 12.731(2), c 11.524(2) A, V 983.6(3) A 3 , Z = 4, has been refined on the basis of F 2 for all unique data collected with monochromatic Mo K α X-radiation and a CCD-based detector. The agreement factor ( R 1) was 3.5%, calculated using 532 unique observed reflections (| F o | ≥ 4σ F ), and the goodness-of-fit ( S ) was 0.92. This study indicates that iriginite crystallizes in space group Pbcm , rather than Pca 2 1 as indicated in a previous investigation. The structure contains one symmetrically distinct U 6+ cation that is strongly bonded to two atoms of O, forming a nearly linear uranyl ion ( Ur ) coordinated by five additional atoms of O arranged at the equatorial corners of pentagonal bipyramids that are capped by the O Ur atoms. The single symmetrically distinct Mo 6+ cation is in a distorted octahedral coordination involving five atoms of O and one H 2 O group. The structure consists of symmetrically identical sheets of edge-sharing Ur ϕ 5 pentagonal bipyramids and Moϕ 6 octahedra (ϕ: unspecified ligand), with composition [(UO 2 )Mo 2 O 7 (H 2 O) 2 ] 0 . The sheets are linked together via H bonds involving interlayer H 2 O groups.
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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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 0.000 |
Machine scores (provisional)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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