CRYSTAL GROWTH OF SCHOEPITE ON THE (104) SURFACE OF CALCITE
Bibliographic record
Abstract
Schoepite, [(UO2)8O2(OH)12](H2O)12, precipitates through interaction of acidic and basic uranyl solutions with calcite. The uranyl solutions have (UO2)2+ concentrations between 1.5 and 50 mmol L–1, and initial pH values of 2.5, 4.5 and 10.0. Examina-tions with the atomic force microscope (AFM) reveal different morphologies of schoepite crystals grown on the (104) surface of calcite. Crystals grown during in situ experiments with uranyl nitrate solutions (initial pH = 2.5) have a platy morphology, and their prominent (001) faces are defined by [210] edges. Crystals grown during in situ experiments with uranyl acetate solution (initial pH = 4.5) seem more bulky, with poorly defined rectangular (001) faces. Examinations of calcite surfaces after interaction with a slightly acidic solution for three days (final pH between 5.5 and 6.5) show platy asymmetrical crystals with prominent (001) faces that are defined by [100], [010], [120], and [110] edges. Experiments with basic solutions after three weeks (final pH between 7.5 and 8.0) show bulky rectangular crystals of schoepite, in which the (001) face is mainly defined by [100] and [010] edges. The different thicknesses of schoepite crystals in the in situ experiments are explained by the different growth-rates of S and F faces in solutions with different saturation-indices with respect to schoepite. The occurrence of edges on the (001) face of schoepite crystals is explained by structural parameters of the chains of polyhedra parallel to the edges and the pH of the solution.
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.
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 | 0.000 | 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) | 0.000 | 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".