γ-U phase in U-Pt system retained to low temperatures by means of rapid cooling

Splat-cooling technique with a cooling rate better than 10 ⁶ K/s helps to increase the Pt solubility in the (cubic) γ-U phase and retain such γ-U phase in U-15 at.% Pt splat down to low temperatures. The splat-cooled U-Pt alloys are very stable in exposing to air. The γ-U phase (U-15 at.% Pt splat) is characterized by a negative temperature coefficient of the resistivity (d ρ/d T < 0). The splats become superconducting below 1.1 K.