Abstract
The crystals of Gd2(SO4)3·8H2O were obtained by slow crystallization from a saturated solution previously received by dissolving Gd2O3 in an aqueous solution of sulfuric acid. The thermal behavior of this salt was studied using simultaneous DTA–TG technique under a nitrogen and air, in the temperature range of 298–1773 K. It was found that the dehydration of gadolinium sulfate octahydrate as well as thermal decomposition of anhydrous Gd2(SO4)3 undergo in two steps. The existence of two polymorphic modification of anhydrous gadolinium sulfate has been confirmed. The new XRD data for high-temperature polymorph of Gd2(SO4)3 were given. All intermediate products of dehydration and thermal decomposition were characterized by EPR method.
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