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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Superconductivity in a uranium containing high entropy alloy.

W L Nelson1,2, A T Chemey3, M Hertz3

  • 1National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, 32310, USA.

Scientific Reports
|March 15, 2020
PubMed
Summary
This summary is machine-generated.

We discovered a new high entropy alloy (HEA) containing an actinide element. This novel material exhibits robust superconductivity, opening possibilities for advanced waste form applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nuclear Engineering

Background:

  • High entropy alloys (HEAs) are complex materials with disordered atomic arrangements, offering unique properties.
  • Existing HEAs demonstrate high strength, damage resistance, and superconductivity.
  • The incorporation of f-electron elements, particularly actinides, into HEAs remains largely unexplored.

Purpose of the Study:

  • To synthesize and characterize a novel actinide-containing high entropy alloy.
  • To investigate the structural and superconducting properties of this new class of HEA.
  • To explore the potential of actinide HEAs as functional waste forms.

Main Methods:

  • Synthesis of the [TaNb]0.31(TiUHf)0.69 alloy.
  • X-ray diffraction for structural analysis (body-centered cubic lattice determination).
  • Measurement of superconducting transition temperature (Tc) and upper critical field (Hc2).

Main Results:

  • Discovery of a new f-electron high entropy alloy, [TaNb]0.31(TiUHf)0.69, incorporating an actinide ion.
  • Crystallization in a body-centered cubic lattice with a lattice constant of 3.41(1) Å.
  • Observation of phonon-mediated superconductivity with Tc ≈ 3.2 K and Hc2 ≈ 6.4 T.

Conclusions:

  • This study introduces the first actinide-containing high entropy alloy.
  • Superconductivity is confirmed to be robust in this new sub-group of HEAs.
  • The findings pave the way for utilizing actinide HEAs as functional waste forms for radioisotopes.