Thulium iodate is an inorganic compound with the chemical formula Tm(IO3)3. It can be prepared by the hydrothermal reaction of periodic acid and thulium periodate in water at 160 °C. Its crystals can also be crystallized in boiling nitric acid. Its solubility in water at 25 °C is 1.467±0.001 10−3 mol·dm−3). Adding dimethyl sulfoxide to water will reduce the solubility.
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