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Thermal dehydration and structural models of two new vanadyl sulfate hydrates

1982; Elsevier BV; Volume: 45; Issue: 1 Linguagem: Inglês

10.1016/0022-4596(82)90297-3

1095-726X

Roman Schneider, J.R. Günter, H. R. Oswald,

Chemical Thermodynamics and Molecular Structure

The preparation of a new modification of vanadyl sulfate trihydrate, VOSO4 · 3H2O, is described. In the course of its thermal dehydration, another new phase, VOSO4 · 2H2O, is observed as an intermediate. Crystal data for the two compounds are: VOSO4 · 3H2O, orthorhombic, a = 8.980 ± 0.006, b = 9.026 ± 0.009, c = 7.776 ± 0.003 Å, space group P21212; VOSO4 · 2H2O, monoclinic, a = 8.913 ± 0.027, b = 8.93 ± 0.09, c = 7.80 ± 0.06 Å, β = 92.4 ± 0.6°. From the topotaxy of the dehydration reaction, structural models for the two phases are deduced. They consist essentially of VOSO4 layers similar to those in α-VOSO4 and interlayer water.