The crystal structure of Yb2(SO4)3·3H2O and its decomposition product, β-Yb2(SO4)3

► The crystal structure and decomposition reactions of Yb2(SO4)3·3H2O. ► The crystal structure of a twinned crystal of β-Yb2(SO4)3. ► Comparison of the structures of β-Yb2(SO4)3 and Y2(SO4)3.