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The structures and crystal chemistry of magnesium chloride and cadmium chloride

1991; Elsevier BV; Volume: 95; Issue: 1 Linguagem: Inglês

10.1016/0022-4596(91)90387-w

1095-726X

D.E. Partin, M. O’Keeffe,

Crystal Structures and Properties

The crystal structures of MgCl2 and CdCl2 have been refined using powder X-ray diffraction data. They have space group R3m. For magnesium chloride a = 3.6363(1) Å, c = 17.6663(5) Å, V = 202.31 Å3, Dx = 2.35 g cm−3, Mg 0,0,0; Cl 0,0,0.25784(8), and for cadmium chloride a = 3.8459(1) Å, c = 17.4931(4) Å, V = 224.07 Å3, Dx = 4.08 g cm−3, Cd 0,0,0; Cl 0,0,0.2520(1). d(MgCl) = 2.4873(6) Å (6×), d(CdCl) = 2.637(1) (6×). The structures and their relationship to that of fluorite are discussed within the framework of a simple Born-Mayer model.