Chemical and spectroscopic investigations of <scp>K‐H<sub>3</sub>O‐Na</scp> jarosite solid solutions applicable for Mars explorations
Bibliographic record
Abstract
Jarosite is the first definitely discovered ferric sulfate mineral on Mars, indicating a highly acidic environment in Martian history. K‐H 3 O and Na‐H 3 O jarosite solid solutions were synthesized under hydrothermal conditions. Phase identifications and chemical compositions were determined by X‐ray diffraction and scanning electron microscopy coupled with energy dispersive spectroscopy. Raman spectra of those two series of jarosite solid solutions show systematic spectral changes with varying alkali content. When chemical ratios of K/(K + H 3 O), in K‐H 3 O jarosite solid solutions, increase from 0% to 88%, their Raman peaks exhibit systematic shifts: ν 2 (SO 4 ) 2− (from 424.7 to 434.3 cm −1 ), ν 4 (SO 4 ) 2‐ (from 619.6 to 623.8 cm −1 ), ν 1 (SO 4 ) 2‐ (from 1,011.8 to 1,006.1 cm −1 ) and, ν 3 (SO 4 ) 2− (from 1,165.4 to 1,152.9 cm −1 ). Near‐infrared and mid‐infrared spectra were also collected for the spectral library of Mars remote‐sensing studies. The detailed chemical and spectroscopic studies of K‐H 3 O‐Na jarosite solid solutions would contribute to their potential discoveries on Mars by future Mars missions (e.g., Mars 2020 and ExoMars). Copyright © 2017 John Wiley & Sons, Ltd.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 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".