Abstract
U-Ti and U-Ru alloys with various Ti, Ru concentrations were prepared using an ultrafast-cooling technique (splat cooling). A phase analysis by X-ray diffraction revealed the presence of the bcc gamma-U phase developing with increasing concentration of alloying elements, while the concentration of orthorhombic alpha-U structure decreases.
The tetragonally distorted gamma degrees phase, (existing for 8-10 at. % Ru) is followed by pure cubic gamma-U phase (for 12, 15% Ru). For Ti, more than 20 at. % is needed to yield pure gamma-U phase.
The occurrence of superconductivity was investigated by resistivity and specific heat measurements down to 0.4 K in various magnetic fields. All U-T splats studied become superconducting with T-c not exceeding 2.0 K.