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Acta Metallurgica Sinica (English Letters)

, Volume 29, Issue 4, pp 388–398 | Cite as

Structure, Electrical Resistivity and Superconductivity of Low-alloyed γ-U Phase Retained to Low Temperatures by Means of Rapid Cooling

  • M. Krupska
  • N.-T. H. Kim-NganEmail author
  • S. Sowa
  • M. Paukov
  • I. Tkach
  • D. Drozdenko
  • L. Havela
  • Z. Tarnawski
Article

Abstract

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.

Keywords

Crystal structure Electrical resistivity Metallic system Superconductivity 

Notes

Acknowledgments

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.

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Copyright information

© The Chinese Society for Metals and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • M. Krupska
    • 1
  • N.-T. H. Kim-Ngan
    • 1
    Email author
  • S. Sowa
    • 1
  • M. Paukov
    • 2
  • I. Tkach
    • 2
  • D. Drozdenko
    • 2
  • L. Havela
    • 2
  • Z. Tarnawski
    • 3
  1. 1.Institute of PhysicsPedagogical UniversityKrakówPoland
  2. 2.Faculty of Mathematics and PhysicsCharles UniversityPragueCzech Republic
  3. 3.Faculty of Physics and Applied Computer ScienceAGH University of Science and TechnologyKrakówPoland

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