Effects of the Iron Content and Redox State on the Structure of Sodium Borosilicate Glasses: A <scp>R</scp> aman, <scp>M</scp> össbauer and Boron K‐Edge <scp>XANES</scp> Spectroscopy Study
Bibliographic record
Abstract
The structure of iron‐bearing sodium borosilicate glasses with up to 10 mol% “ FeO ” has been investigated in the range 0.15 < Fe 3+ /Σ Fe < 0.95. According to M össbauer spectroscopy, Fe 3+ and Fe 2+ are mainly in tetrahedral and octahedral coordination, respectively, although other coordination states exist for both cations. From XANES experiments, we conclude that increasing Fe content and varying redox states have only a minor effect on the relative proportions of BO 3 and BO 4 units. In R aman spectra, a decrease of the proportion of BO 4 species present in danburite‐like units ( Na 2 O · B 2 O 3 ·2 SiO 2 ) is found upon increasing iron content and oxidizing state. Whereas the insensitivity of the overall boron speciation to iron content and redox state points to weak interactions between boron and iron, the changes affecting BO 4 species do indicate a more subtle interplay between Fe 3+ and the other tetrahedrally coordinated cations ( Si , B ) because of the competition between tetrahedral Fe 3+ and B 3+ for charge compensation by Na + .
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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 | 0.000 | 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".