Holmium(III) iodide is an iodide of holmium, with the chemical formula of HoI3. It is used as a component of metal halide lamps.[5]
Holmium(III) iodide can be obtained by directly reacting holmium and iodine:[4]
Holmium(III) iodide can also be obtained via the direct reaction between holmium and mercury(II) iodide:
The mercury produced in the reaction can be removed by distillation.[6]
Holmium(III) iodide hydrate can be converted to the anhydrous form by dehydration with a large excess of ammonium iodide (since the compound is prone to hydrolysis).[4]
Holmium(III) iodide is a highly hygroscopic substance that dissolves in water.[7][3][2] It forms yellow hexagonal crystals with a crystal structure similar to bismuth(III) iodide.[4] In air, it quickly absorbs moisture and forms hydrates. The corresponding oxide iodide is also readily formed at elevated temperature.[4]
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