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The Crystal Structures of two Anhydrous Magnesium Hydroxychloride Phases from in situ Synchrotron Powder Diffraction Data

The crystal structures of two members of the solid solution series Mg(OH)xCly x+y = 2, Mg(OH)1.7Cl0.3 (P3¯ 6 m1, a = 3.169(2) Å, c = 5.530(12), V = 48.1(1) Å3 at T = 365 °C) and MgOHCl (R3¯m, a = 3.3877(4) Å, c = 17.534(4) Å, V = 174.27(6) Å3 at T = 625 °C) were determined from in situ synchrotron powder diffraction data at high temperature upon dehydration of 3Mg(OH)2·MgCl2·8H2O (F3) and 5Mg(OH)2·MgCl2·8H2O (F5) phases. The crystal structures of 11 Mg(OH)1.7Cl0.3 (example of ss-type-OH) and MgOHCl (example of ss-type-Cl) can be related to the C19 (CdCl2) and C6 (CdI2) structure type, respectively, with the disordered chloride and hydroxide anions occupying the same crystallographic site in layers.

Magnesia binder phases; Magnesium; Sorel cement; Synchrotron radiation; X-ray diffraction

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