K. Keefer, M. Hochella, B. Jong
May 15, 1981
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0
Influential Citations
25
Citations
Journal
Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry
Abstract
Experimental The magnesium hydroxide sulfate hydrate MgSO4.~Mg(OH)2.~H20 crystallizes in the tetragonal space group I4~/amd with cell dimensions al a 2 -- 5.242 (1), c -- 12.995 (3) A, Z -- 4. The structure was solved by Patterson methods and refined to R = 0.041 using 160 single-crystal X-ray diffraction intensities measured with a four-circle diffractometer. Mg 2+ is octahedrally coordinated by the O atoms of four different SO 2- and two OH- or H20. The structure consists of straight chains of face-sharing oxygen octahedra, two-thirds of which have Mg 2+ at their centers. This phase is considered to be stoichiometric; a partially ordered atomic arrangement is proposed to account for the integral coefficients in the formula. The structure is related to those of the sulfate monohydrates of divalent Mg, Mn, Fe, Co, Ni and Zn.