1. Superconductivity in a uranium containing high entropy alloy.
- Author
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Nelson, W. L., Chemey, A. T., Hertz, M., Choi, E., Graf, D. E., Latturner, S., Albrecht-Schmitt, T. E., Wei, K., and Baumbach, R. E.
- Subjects
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ALLOYS , *CRYSTALLINE interfaces , *HEAT resistant alloys , *SUPERCONDUCTIVITY , *ACTINIDE elements - Abstract
High entropy alloys (HEA) are an unusual class of materials where mixtures of elements are stochastically arrayed on a simple crystalline lattice. These systems exhibit remarkable functionality, often along several distinct axes: e.g., the examples [TaNb]1-x(TiZrHf)x are high strength and damage resistant refractory metals that also exhibit superconductivity with large upper critical fields. Here we report the discovery of an f-electron containing HEA, [TaNb]0.31(TiUHf)0.69, which is the first to include an actinide ion. Similar to the Zr-analogue, this material crystallizes in a body-centered cubic lattice with the lattice constant a = 3.41(1) Å and exhibits phonon mediated superconductivity with a transition temperatures Tc ≈ 3.2 K and upper critical fields Hc2 ≈ 6.4 T. These results expand this class of materials to include actinide elements, shows that superconductivity is robust in this sub-group, and opens the path towards leveraging HEAs as functional waste forms for a variety of radioisotopes. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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