Hafnium(IV) iodate, or hafnium iodate, is an inorganic compound of hafnium with the chemical formula Hf(IO3)4.
Properties Hafnium(IV) iodate is only very slightly soluble in water. At 25 °C, the solubility of Hf(IO3)4 in water has been reported as approximately 4.2 × 10−6 mol kg−1. It is also poorly soluble in acidic media.
In aqueous systems containing alkali-metal iodates, hafnium(IV) iodate can form solid solutions. Solid solutions based on Hf(IO3)4 have, for example, been reported in the LiIO3–Hf(IO3)4–H2O, RbIO3–Hf(IO3)4–H2O and CsIO3–Hf(IO3)4–H2O systems.
Preparation Hafnium(IV) iodate can be prepared by reacting hydrated hafnium(IV) oxide with an aqueous solution of iodic acid. Depending on the reaction conditions, the acidic iodate HHf(IO3)5·3H2O can also be obtained.
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