Structure, Electrical Resistivity and Superconductivity of Low-alloyed γ-U Phase Retained to Low Temperatures by Means of Rapid Cooling
- 173 Downloads
The γ-U phase alloys can be retained down to low temperatures with less required alloying concentration by using the splat-cooling technique with a cooling rate better than 106 K/s. Doping with 15 at.% Mo, Pt, Pd, Nb leads to a stabilization of the cubic γ-U phase, while it requires much higher Zr concentrations (≥30 at.% Zr). All U–T splats become superconducting with T c in the range of 0.61–2.11 K. A good agreement of the experimentally observed specific-heat jump at T c with that from BCS theory prediction was obtained for U-15 at.% Mo consisting of the γ-U phase with an ideal bcc A2 structure.
KeywordsCrystal structure Electrical resistivity Metallic system Superconductivity
This work was supported by the Czech Science Foundation under the Grant No. 15-01100S. Experiments were partly performed at MLTL (http://mltl.eu/) supported within the program of Czech Research Infrastructures (No. LM2011025). M.P. was supported by the Grant Agency of the Charles University under the Project No. 1332314. Participation of Krakow group was supported by the Czech-Polish cooperation in the scope of Czech-Polish project 7AMB14PL036 (9004/R14/R15). N-T.H.K-N acknowledges the European Regional Development Fund under the Infrastructure and Environment Programme.
- I. Grenthe, J. Drozdzynski, T. Fujino, E.C. Buck, T.E. Albrecht-Schmitt, S.F. Wolf, in The Chemistry of the Actinide and Transactinide Elements, vol. 1, ed. by L.R. Morss, N. Edelstein, J. Fuger, J.J. Katz (Springer, 2006), p. 253Google Scholar
- H.L. Yakel, A review of X-ray diffraction studies in uranium alloys, in Proceedings of the Physical Metallurgy of Uranium Alloys Conference, Vail, Colorado, USA, 12–14 February 1974Google Scholar
- G. Aschermann, E. Justi, Phys. Z. 43, 207 (1942)Google Scholar
- G.L. Hofman, M.K. Meyer, A.E. Ray, Design of high density gamma-phase uranium alloys for LEU dispersion fuel applications, in Proceedings of International Reduced Enrichment for Research and Test Reactors Conference, Sao Paulo, Brazil, 18–20 October 1998Google Scholar
- R. Ray, E. Musso, U.S. Patent 3,981,722, 21 Sept 1976Google Scholar
- G.C. Allen, P.M. Tucker, R.A. Lewis, J. Chem. Soc., Faraday Trans. II 80, 991 (1984)Google Scholar
- A. Slebarski, J. Goraus, J. Deniszczyk, L. Skoczen, J. Phys.: Condens. Matter 18, 10319 (2006)Google Scholar