Hybrid inorganic–organic layered crystals constructed by oxide clusters and surfactant
Bibliographic record
Abstract
Veblenite, ideally KNa(Fe 2+ 5 Fe 3+ 4 Mn 7 )Nb 4 (Si 2 O 7 ) 2 (Si 8 O 22 ) 2 O 6 (OH) 10 (H 2 O) 3 , triclicnic, P¯1, a 5.3761(3), b 27.5062(11), c 18.6972(9) Å, α 140.301(3), β 93.033(3), γ 95.664(3) ° , V 1720.96(14)Å 3 , has no natural or synthetic analogues.It is a new mineral occurring at Ten Mile Lake, Seal Lake area, Labrador, Newfoundland, Canada, as red brown single laths and fibres included in feldspar.In the crystal structure of veblenite, M octahedra share common edges to form a wavy octahedral sheet parallel to (001).SiO 4 tetrahedra share corners to form Si 2 O 7 groups and Si 8 O 22 ribbons.This is the first occurrence of an eightmembered Si-O ribbon in a mineral crystal structure.The Nb-dominant D octahedra, Si 2 O 7 groups and Si 8 O 22 ribbons share common vertices to form a heteropolyhedral (H) sheet.Two H sheets and an O sheet constitute an HOH block.Along [001], HOH blocks connect via common vertices of D octahedra and cations at the A(1,2) and B interstitial sites.In the intermediate space between two adjacent HOH blocks, two [100] channels of different size can be identified.A narrow channel of the width of an Si 2 O 7 group contains the A(1) site mainly occupied by K.A large channel has the width of four Si 2 O 7 groups (Si 8 O 22 ribbon) and contains A(2) sites partly occupied by K and H 2 O groups.The crystal structure of veblenite is related to several HOH structures where the O sheet is ideally composed of Fe 2+ octahedra, such as jinshanjiangite [1], niobophyllite [2] (astrophyllite group) and nafertisite [3].Veblenite differs from those structures in the topology and chemistry of the H sheet.In jinshajiangite, the H sheet consists of (Si 2 O 7 ) groups and Ti-dominant octahedra.In niobophyllite, the H sheet is composed of (Si 4 O 12 ) astrophyllite ribbons [a double ribbon of (Si 2 O 7 ) groups] and Nb-dominant octahedra.In nafertisite, the H sheet is composed of (Si 6 O 17 ) ribbons [a triple ribbon of (Si 2 O 7 ) groups] and Ti-dominant octahedra.In veblenite, the H sheet is composed of (Si 2 O 7 ) groups (as in jinshajiangite), (Si 8 O 22 ) ribbons [a new type of a quadruple ribbon of (Si 2 O 7 ) groups which can be built of two astrophyllite ribbons] and Nb-dominant octahedra.The above reported setting is obtained from the reduced cell a 5.3761(3), b 17.7419(10), c 18.6972(11) Å, α 97.991(1), β 93.032(2), γ 102.050(1)º thorough the transformation (1,0,0|0,1,1 |0,0,1).The chosen setting with a large α is preferred in order to compare the structure topology of veblenite to those of jinshajiangite and niobophyllite.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".