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Glass transition temperatures and crystallization kinetics of a synthetic, anhydrous, amorphous calcium-magnesium carbonate

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2023

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Hess, Kai-Uwe
Schawe, Jürgen E. K.
Wilding, Martin
Purgstaller, Bettina
Goetschl, Katja E.
Sturm, Sebastian
Müller-Caspary, Knut
Schmahl, Wolfgang
Griesshaber, Erika
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Philosophical Transactions of the Royal Society of London, Series A : Mathematical, Physical and Engineering Sciences. Royal Society of London. 2023, 381, 20220356. ISSN 1364-503X. eISSN 1471-2962. Available under: doi: 10.1098/rsta.2022.0356

Zusammenfassung

We report the first calorimetric observations of glass transition temperatures and crystallization rates of anhydrous, amorphous calcium-magnesium carbonate using fast scanning differential scanning calorimetry. Hydrous amorphous Ca0.95Mg0.05CO3· 0.5H2O (ACMC) solid was precipitated from a MgCl2–NaHCO3 buffered solution, separated from the supernatant, and freeze-dried. An aliquot of the freeze-dried samples was additionally dried at 250°C for up to 6 h in a furnace and in a high-purity N2 atmosphere to produce anhydrous ACMC. The glass transition temperature of the anhydrous Ca0.95Mg0.05CO3 was determined by applying different heating rates (1000–6000 K s−1) and correcting for thermal lag to be 376°C and the relaxational heat capacity was determined to be Cp = 0.16 J/(g K). Additionally, the heating rate dependence of the temperature that is associated with the corrected crystallization peaks is used to determine the activation energy of crystallization to be 275 kJ mol−1. A high-resolution transmission electron microscopy study on the hydrous and anhydrous samples provided further constraints on their compositional and structural states.

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540 Chemie

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amorphous calcium-magnesium carbonate, glass transition temperature, lyophilization, crystallization dynamics, scanningtransmission electron microscopy, fastscanning differential scanning calorimetry

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ISO 690HESS, Kai-Uwe, Jürgen E. K. SCHAWE, Martin WILDING, Bettina PURGSTALLER, Katja E. GOETSCHL, Sebastian STURM, Knut MÜLLER-CASPARY, Elena V. STURM, Wolfgang SCHMAHL, Erika GRIESSHABER, 2023. Glass transition temperatures and crystallization kinetics of a synthetic, anhydrous, amorphous calcium-magnesium carbonate. In: Philosophical Transactions of the Royal Society of London, Series A : Mathematical, Physical and Engineering Sciences. Royal Society of London. 2023, 381, 20220356. ISSN 1364-503X. eISSN 1471-2962. Available under: doi: 10.1098/rsta.2022.0356
BibTex
@article{Hess2023-08-28Glass-67899,
  year={2023},
  doi={10.1098/rsta.2022.0356},
  title={Glass transition temperatures and crystallization kinetics of a synthetic, anhydrous, amorphous calcium-magnesium carbonate},
  volume={381},
  issn={1364-503X},
  journal={Philosophical Transactions of the Royal Society of London, Series A : Mathematical, Physical and Engineering Sciences},
  author={Hess, Kai-Uwe and Schawe, Jürgen E. K. and Wilding, Martin and Purgstaller, Bettina and Goetschl, Katja E. and Sturm, Sebastian and Müller-Caspary, Knut and Sturm, Elena V. and Schmahl, Wolfgang and Griesshaber, Erika},
  note={Article Number: 20220356}
}
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