Hydrated Dysprosium Iodides: Preparation and Properties

Phase equilibria in the Dy2O3-HI-H2O and DyI3-HI-H2O systems were studied by the isothermal saturation method at 25°C. Crystallization ranges for dysprosium triiodide nonahydrate Dy2I3 · 9H2O and the basic iodide Dy2I(OH)5 · 2H2O were found. The crystal hydrates were examined by X-ray diffraction, thermogravimetric, and optical crystal analyses.