Hydrated magnesium carbonates derived from brucite: Structural and vibrational analysis via synchrotron XRD and Raman spectroscopy
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Bibliographic record
Abstract
This study explores the formation of hydrated magnesium carbonates (HMCs) cement via the carbonation of brucite [Image 1] using sodium bicarbonate [Image 2] as a carbon source. Employing synchrotron radiation X-ray diffraction (SRXRD) and time-gated Raman spectroscopy (tgRS), we investigate the HMCs formation and their conversion in pure aqueous solution and solutions containing 1 M magnesium acetate (MgAc, Image 3). While previous studies have established the influence of reaction time and MgAc ligands on HMC formation, we present deeper insights into the role of sodium (Na) and MgAc in this system. Notably, eitelite [Image 4], a Na-containing carbonated phase, was detected after 7 and 28 days of carbonation in water [Image 5] but was absent when MgAc was present in the solution, revealing a key role of MgAc on phase selection. Additionally, acetate actively involves into the formation of an organo-modified HMC, identified as acetate-containing giorgiosite (ACG, Image 6), form through the conversion of nesquehonite [Image 7]. This phase was detected just 1 day into the reaction - significantly earlier than previously reported crystallization times. As the reaction time progressed, nesquehonite gradually converted into ACG in the presence of MgAc, and into eitelite in the absence of MgAc. These findings underscore the complementary strengths of SRXRD and tgRS in elucidating HMC formation and conversion pathways - SRXRD can tracks early-stage carbonation products, while tgRS provides molecular-level insights. Together, these techniques not only validate prior studies but also reveal additional mechanistic details governing HMC cement formation.
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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 it