Journal
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
Volume 638, Issue 3-4, Pages 628-633Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/zaac.201100497
Keywords
Magnesia cement; Magnesium oxide chloride cement; System MgO-MgCl2-H2O; X-ray powder diffraction; 2-1-4 Phase; 2-1-2 Phase
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Funding
- Bundesministerium fur Bildung und Forschung (BMBF) [02C1204]
- Bundesministerium fur Wirtschaft und Technologie (BMWi) [02E10880]
- Fonds der Chemischen Industrie (FCI)
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In the course of investigations relating to magnesia cement the basic magnesium salt hydrates 2Mg(OH)2 center dot MgCl2 center dot 2H2O (2-1-2 phase) and 2Mg(OH)2 center dot MgCl2 center dot 4H2O (2-1-4 phase) were found as stable phases in the system MgO-MgCl2-H2O at a temperature of T = 120 degrees C and were characterized by thermal analysis, Raman spectroscopy and X-ray powder diffraction. The crystal structures of the 2-1-2 and 2-1-4 phases were determined from high resolution laboratory X-ray powder diffraction data.Both phases crystallize in space group C2/m with Z = 2 (2-1-2: a = 15.3285(3) angstrom, b = 3.2208(5) angstrom, c = 8.1096(2) angstrom, beta = 91.99(1)degrees, V = 400.13(2) angstrom 3; 2-1-4: a = 15.1264 angstrom, b = 3.1715(2) angstrom, c = 10.5230(1) angstrom, beta = 101.55(1)degrees, V = 494.60(1) angstrom 3). The main building unit of both crystal structures is made up by infinite triple chains of edge-linked distorted MgO6 octahedra. In case of the 2-1-4 phase, the parallel stacks are in addition separated by interstitial one dimensional zig-zag chains of disordered Cl ions and H2O molecules.
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