Zur Kenntnis von Gadolinium(III)-sulfit Dihydrat Gd2(SO3)3· 2 H2O/ On the Existance of Gadolinium (III)-sulfite Dihydrate Gd2(SO3)3 · 2H2O

Abstract

Different hydrates of Gd2(SO3)3 are obtained depending on preparation conditions. For preparation of Gd2(SO3)3, gaseous SO2 is passed through a suspension of Gd2O3 in H2O at room temperature until a clear solution is formed. Upon immediate heating to about 100 °C a mixture of Gd2(SO3)3 · 2H2O and Gd2(SO3)3 · 3H2O is formed. If the boiling procedure is performed after 6 days, a pure product consisting of the trihydrate is obtained. The different phases are identified by REM, DTA -TG -investigation and X-ray powder analysis. The X-ray powder pattern of Gd2(SO3)3 · 2H2O is consistent with patterns of isotype Ln2(SO3)3 · H2O were Ln = Pr, Nd, Sm and Eu.