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Crystal structure and characterization of magnesium carbonate chloride heptahydrate

Rincke, C.; Schmidt, H.; Buth, G.; Voigt, W.

Abstract:
MgCO$_{3}$·MgCl$_{2}$·7H$_{2}$O is the only known neutral magnesium carbonate con­taining chloride ions at ambient conditions. According to the literature, only small and twinned crystals of this double salt could be synthesised in a concentrated solution of MgCl$_{2}$. For the crystal structure solution, single-crystal diffraction was carried out at a synchrotron radiation source. The monoclinic crystal structure (space group Cc) exhibits double chains of MgO octa­hedra linked by corners, connected by carbonate units and water mol­ecules. The chloride ions are positioned between these double chains parallel to the (100) plane. Dry MgCO$_{3}$·MgCl$_{2}$·7H$_{2}$O decom­poses in the air to chlorartinite, Mg$_{2}$(OH)Cl(CO$_{3}$)·nH$_{2}$O (n = 2 or 3). This work includes an extensive char­acterization of the title com­pound by powder X-ray diffraction, thermal analysis, SEM and vibrational spectroscopy.

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Verlagsausgabe §
DOI: 10.5445/IR/1000123292
Veröffentlicht am 07.09.2020
Originalveröffentlichung
DOI: 10.1107/S2053229620008153
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0108-2701, 1600-5759, 2053-2296
KITopen-ID: 1000123292
HGF-Programm 56.98.01 (POF III, LK 01)
Betrieb in MML
Erschienen in Acta crystallographica / C
Band 76
Seiten 741-745
Schlagwörter magnesium; carbonate; chloride; hydrate; synchrotron; twinning; crystal structure
Nachgewiesen in Scopus
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