It can be synthesised as an intermetallic compound, by direct fusion of pure components at 1700 °C according to
stoichiometric calculations: :3 Pt + U → UPt3 It can also be synthesised by reduction of
uranium dioxide with
hydrogen in the presence of platinum at 1700 °C: :UO2 + 2 H2 + 3 Pt → UPt3 + 2 H2O == Physical properties ==