2013
DOI: 10.1002/chin.201343004
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ChemInform Abstract: 3Mg(OH)2·MgSO4·8H2O: A Metastable Phase in the System Mg(OH)2—MgSO4—H2O.

Abstract: Mg(OH)2-MgSO4-H2O. -3Mg(OH)2·MgSO4·8H2O (3-1-8 phase) and 5Mg(OH)2·MgSO4·2H2O (5-1-2 phase) are obtained from OHsupersaturated MgSO4 solutions which are obtained by suspending highly reactive MgO in differently concentrated MgSO4 solutions followed by filtration and storage at 25 (3-1-8 phase) or 40°C (5-1-2 phase). The 3-1-8 phase is metastable, the 5-1-2 phase stable at room temperature. The former is characterized by thermal analysis, Raman spectroscopy, and high--resolution synchrotron powder XRD (space gr… Show more

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“…20,21 MgO s 4). 8 The molecular arrangement of phase of 5•1•7 is closer than that of phase of 3•1•8. In addition, the main hydration products of magnesium oxysulfate cement, the 3•1•8 phase, begin to decompose by heating at 40 C. In contrast, the 5•1•7 phase only decomposes at 81 C. 12 Therefore, the thermal stability of 5•1•7 phase is superior to 3•1•8 phase.…”
Section: Preparation and Hydration Of Bmsmentioning
confidence: 91%
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“…20,21 MgO s 4). 8 The molecular arrangement of phase of 5•1•7 is closer than that of phase of 3•1•8. In addition, the main hydration products of magnesium oxysulfate cement, the 3•1•8 phase, begin to decompose by heating at 40 C. In contrast, the 5•1•7 phase only decomposes at 81 C. 12 Therefore, the thermal stability of 5•1•7 phase is superior to 3•1•8 phase.…”
Section: Preparation and Hydration Of Bmsmentioning
confidence: 91%
“…In addition, the main hydration products of magnesium oxysulfate cement, the 3•1•8 phase, begin to decompose by heating at 40 C. In contrast, the 5•1•7 phase only decomposes at 81 C. 12 Therefore, the thermal stability of 5•1•7 phase is superior to 3•1•8 phase. 8 This makes the better resistant to hydrothermal performance of BMS than magnesium oxysulfate cement. 22 But the hydrothermal resistance of BMS is lower than that of Portland cement.…”
Section: Preparation and Hydration Of Bmsmentioning
confidence: 99%
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