- Ilja Tkach: Superconductivity in the cubic γ-phase U-Mo, U-Zr alloys synthesized by ultrafast cooling
- 8. 1. 2014, 14:00
- Seminar room KFM, first floor Ke Karlovu 5
- more information
Abstract:
Uranium metal exhibits three allotropic phases, namely alpha (orthorhombic)-, β (tetragonal)- and γ (body-centered cubic). Electronic properties are well known only for α-U which is stable below room temperature. Somewhat β- and γ-U may have different electronic properties, as their density is lower (18.06 g/cm3 for α-U comparing to 19.04 g/cm3 for gamma-U). γ-U is stable only in the range 1045-1405 K, but literature data indicate that it can be preserved by quenching if U is doped by Mo, Zr, Nb, Ti, Re or Ru, among which Mo and Zr are more effective. We undertook a study of (meta) stabilization of the bcc phase corresponding to γ-U using the ultrafast cooling (splat-cooling technique), which yield the bcc phase at lower concentrations of doping. In this work we present results of structure investigations and investigations of electronic properties related to superconductivity in γ-phase uranium-molybdenum and uranium-zirconium alloys.