Why this work is in the frame
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Bibliographic record
Abstract
The crystal structure of epistolite, ideally Na4 Nb2 Ti4+ (Si2O7)2 O2 (OH)2 (H2O)4, a 5.460(1), b 7.170(1), c 12.041(2) Å, 103.63(3), 96.01(3), 89.98(3)°, V 455.4(5) Å3, space group P¯1, Z = 1, Dcalc 2.987 g.cm–3 from the Ilímaussaq alkaline complex, South Greenland, has been solved by direct methods and refined to R1 9.8 % on the basis of 1986 unique reflections |Fo ≥ 4F | collected on a Bruker P4 diffractometer with a CCD 1K Smart detector and MoK radiation. An electron-microprobe analysis gave (wt.%): SiO2 29.59, Nb2O5 31.43, TiO2 10.24, MnO 0.34, Fe2O3 0.35, Ta2O5 0.28, Na2O 14.45, CaO 1.89 K2O 0.27, P2O5 0.36, F 1.32, H2O (calculated from structure refinement) 10.46, total 100.43. The empirical formula is (Na3.79 Ca0.27 Mn0.04)4.06 (Nb1.92 Ti4+0.04 Fe3+0.04)2.00 Ti4+ (Si2O7)2 O2 (OH1.44 F0.56) (H2O), calculated on the basis of 4 Si (apfu). In the crystal structure, there are two tetrahedrally coordinated sites occupied by Si, with a grand <Si–O> distance of 1.617 Å. The (SiO4) tetrahedra link together to form [Si2O7] groups. There are two octahedrally coordinated M sites. The M(1) site is occupied prima-rily by Nb with minor amounts of Fe3+ and Ti4+, with <M(1)–O, H2O> = 2.01 Å. The M(2) site is occupied solely by Ti4+, with <M(2)–O,OH> = 1.962 Å. There are three A sites, occupied primarily by Na: the A(1) and A(2) sites are octahedrally coordinated, with <A(1,2)–O,OH> = 2.39 Å, and the A(3) site is [8]-coordinated, with <A(3)–O,OH,H2O> = 2.57 Å. The A(1) site is occupied by Na, the A(2) site is occupied 92 % by Na, and the A(3) site is approximately half-occupied by Na: 0.87 Na + 0.82 + 0.27 Ca + 0.04 Mn2+ apfu. The M(2) and A(1,2) octahedra each share six common edges to form a close-packed sheet. This sheet of
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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