THERMAL AND CALORIMETRIC INVESTIGATIONS OF MG(IO3)(2)CENTER-DOT-NH2O (N=10, 4) AND THEIR DEUTERATED ANALOGS

A DTA and DSC study was made of the thermal dehydration and decomposit ion of Mg(IO3)(2).4H(2)O and Mg(IO3)(2).4D(2)O. The data obtained show that the dehydration takes place in one stage. The Delta H degrees(de h) obtained were used to calculate Delta H degrees(f), and comparisons were made with the literature data. It was confirmed that the thermal decomposition passes through an intermediate Mg-5(IO6)(2), which is u nstable and immediately decomposes to MgO. An isotope effect is observ ed in both DTA and DSC curves. Thermogravimetric data on Mg(IO3)(2).10 H(2)O are also presented.