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Synthesis and crystal structure solution of potassium dawsonite: An intermediate compound in the alkaline hydrolysis of calcium aluminate cements
Potassium dawsonite is formed as an intermediate compound during the alkaline hydrolysis (AH) in calcium aluminate cements (CACs). A synthesis method of potassium dawsonite has been developed. The crystal structure of potassium dawsonite KAl(CO3)(OH)2 has been solved by direct methods from X-ray powder diffraction data and refined with the Rietveld method. It crystallises in the orthorhombic Cmcm space group with unit cells parameters a=6.3021(3) A, b=11.9626(5) A, c=5.6456(3) A and Z=4. The structure consists of carboaluminate chains, formed by the basic unit (Al 2(OH)4(CO 3)2)2- arranged along the c axis. The carbonate groups are placed in an alternate manner at both sides of the carboaluminate chains. The carboaluminate chains are also held together by the K+ cations that are located in the middle of three such chains. Finally, the chemical reactions explaining the AH process in CACs are postulated.
Synthesis and crystal structure solution of potassium dawsonite: An intermediate compound in the alkaline hydrolysis of calcium aluminate cements
Potassium dawsonite is formed as an intermediate compound during the alkaline hydrolysis (AH) in calcium aluminate cements (CACs). A synthesis method of potassium dawsonite has been developed. The crystal structure of potassium dawsonite KAl(CO3)(OH)2 has been solved by direct methods from X-ray powder diffraction data and refined with the Rietveld method. It crystallises in the orthorhombic Cmcm space group with unit cells parameters a=6.3021(3) A, b=11.9626(5) A, c=5.6456(3) A and Z=4. The structure consists of carboaluminate chains, formed by the basic unit (Al 2(OH)4(CO 3)2)2- arranged along the c axis. The carbonate groups are placed in an alternate manner at both sides of the carboaluminate chains. The carboaluminate chains are also held together by the K+ cations that are located in the middle of three such chains. Finally, the chemical reactions explaining the AH process in CACs are postulated.
Synthesis and crystal structure solution of potassium dawsonite: An intermediate compound in the alkaline hydrolysis of calcium aluminate cements
Fernandez-Carrasco, L. (author) / Puertas, F. (author) / Blanco-Varela, M.T. (author) / Vazquez, T. (author) / Rius, J. (author)
Cement and Concrete Research ; 35 ; 641-646
2005
6 Seiten, 17 Quellen
Article (Journal)
English
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Potassium dawsonite formation in calcium aluminate cements
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Potassium Dawsonite Formation in Calcium Aluminate Cements
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