CRYSTAL CHEMISTRY AND TOPOLOGY OF TWO FLUX-GROWN YTTRIUM SILICATES, BaKYSi2O7 AND Cs3YSi8O19
Why this work is in the frame
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Bibliographic record
Abstract
Two new yttrium silicates have been synthesized by a high-temperature flux-growth technique in air. The phase BaKYSi 2 O 7 is monoclinic, with space group P 2 1 / n , a 9.775(2), b 5.718(1), c 13.096(3) A, β 104.61(3)°, V 708.3(3) A 3 , and Z = 4; Cs 3 YSi 8 O 19 is orthorhombic, space group Pnma , with a 11.476(2), b 7.059(1), c 26.971(5) A, V 2184.9(6) A 3 , and Z = 4. The crystal structures were determined from single-crystal X-ray-diffraction data and refined to R 1( F ) = 2.0% (BaKYSi 2 O 7 ) and R 1( F ) = 2.9% (Cs 3 YSi 8 O 19 ). The phase BaKYSi 2 O 7 represents a novel structure-type, and a compound that may also occur in nature. It has a mixed tetrahedron–octahedron framework structure containing Si 2 O 7 groups and octahedrally coordinated Y atoms ( = 2.256 A). Voids in the framework host [9]-coordinated Ba atoms and [8]-coordinated K atoms. The YO 6 octahedron shares each of its apices with oxygen atoms of the Si 2 O 7 groups. The unusually small Si–O–Si angle of the disilicate group [124.51(9)°] is noteworthy. The diphosphates Na 2 CaP 2 O 7 , M 2 SrP 2 O 7 ( M = K, Rb, Cs) and K 2 CdP 2 O 7 , and the diarsenate K 2 CaAs 2 O 7 , have closely related structures. The phase Cs 3 YSi 8 O 19 is isotypic with isoelectronic Cs 3 ScSi 8 O 19 and the second representative of the microporous framework structure-type MCV–1. The silicate has a mixed octahedron–tetrahedron framework structure with a [ T O 4 ]:[ M O 6 ] ratio of 8:1. The structure contains isolated YO 6 octahedra ( = 2.251 A) sharing corners with SiO 4 tetrahedra to form an open framework with four-, six- and eight-membered rings. Large voids host two fully occupied Cs positions and four partly occupied and disordered Cs positions.
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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 | 0.000 | 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 it