Publikation: Glass transition temperatures and crystallization kinetics of a synthetic, anhydrous, amorphous calcium-magnesium carbonate
Dateien
Datum
Autor:innen
Herausgeber:innen
ISSN der Zeitschrift
Electronic ISSN
ISBN
Bibliografische Daten
Verlag
Schriftenreihe
Auflagebezeichnung
URI (zitierfähiger Link)
DOI (zitierfähiger Link)
Internationale Patentnummer
Link zur Lizenz
Angaben zur Forschungsförderung
Projekt
Open Access-Veröffentlichung
Sammlungen
Core Facility der Universität Konstanz
Titel in einer weiteren Sprache
Publikationstyp
Publikationsstatus
Erschienen in
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.
Zusammenfassung in einer weiteren Sprache
Fachgebiet (DDC)
Schlagwörter
Konferenz
Rezension
Zitieren
ISO 690
HESS, 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.2022.0356BibTex
@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} }
RDF
<rdf:RDF xmlns:dcterms="http://purl.org/dc/terms/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:void="http://rdfs.org/ns/void#" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/server/rdf/resource/123456789/67899"> <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/> <dc:contributor>Wilding, Martin</dc:contributor> <dc:contributor>Purgstaller, Bettina</dc:contributor> <dc:language>eng</dc:language> <dc:contributor>Sturm, Sebastian</dc:contributor> <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/29"/> <dc:creator>Purgstaller, Bettina</dc:creator> <dc:creator>Sturm, Sebastian</dc:creator> <dc:creator>Griesshaber, Erika</dc:creator> <dc:creator>Schawe, Jürgen E. K.</dc:creator> <dc:contributor>Griesshaber, Erika</dc:contributor> <dc:creator>Sturm, Elena V.</dc:creator> <dcterms:issued>2023-08-28</dcterms:issued> <dc:contributor>Goetschl, Katja E.</dc:contributor> <dc:creator>Wilding, Martin</dc:creator> <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/29"/> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2023-10-06T08:48:32Z</dc:date> <dc:contributor>Hess, Kai-Uwe</dc:contributor> <dc:contributor>Müller-Caspary, Knut</dc:contributor> <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/67899/1/Hess_2-a5sqy9d0k4w13.pdf"/> <dc:creator>Müller-Caspary, Knut</dc:creator> <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/67899/1/Hess_2-a5sqy9d0k4w13.pdf"/> <dc:contributor>Schmahl, Wolfgang</dc:contributor> <dc:contributor>Sturm, Elena V.</dc:contributor> <foaf:homepage rdf:resource="http://localhost:8080/"/> <bibo:uri rdf:resource="https://kops.uni-konstanz.de/handle/123456789/67899"/> <dcterms:title>Glass transition temperatures and crystallization kinetics of a synthetic, anhydrous, amorphous calcium-magnesium carbonate</dcterms:title> <dcterms:abstract>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 Ca<sub>0.95</sub>Mg<sub>0.05</sub>CO<sub>3</sub>· 0.5H<sub>2</sub>O (ACMC) solid was precipitated from a MgCl<sub>2</sub>–NaHCO<sub>3</sub> 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 N<sub>2</sub> atmosphere to produce anhydrous ACMC. The glass transition temperature of the anhydrous Ca<sub>0.95</sub>Mg<sub>0.05</sub>CO<sub>3</sub> was determined by applying different heating rates (1000–6000 K s<sup>−1</sup>) 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<sup>−1</sup>. A high-resolution transmission electron microscopy study on the hydrous and anhydrous samples provided further constraints on their compositional and structural states.</dcterms:abstract> <dc:creator>Hess, Kai-Uwe</dc:creator> <dc:contributor>Schawe, Jürgen E. K.</dc:contributor> <dc:creator>Schmahl, Wolfgang</dc:creator> <dc:creator>Goetschl, Katja E.</dc:creator> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2023-10-06T08:48:32Z</dcterms:available> </rdf:Description> </rdf:RDF>