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]
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Other names
Holmium iodide
Holmium triiodide | |
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3D model (JSmol)
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ECHA InfoCard | 100.034.050 |
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CompTox Dashboard (EPA)
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Properties | |
HoI3 | |
Molar mass | 545.6437 g/mol |
Appearance | Pale-yellow solid[1][2] |
Density | 5.4 g/cm3[3] |
Melting point | 994 °C[2] |
Boiling point | 1300 °C[4] |
soluble in water[2] | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
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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]