Thermal and transport properties of U3Si2

Daniel J. Antonio; Keshav Shrestha; Jason M. Harp; Cynthia A. Adkins; Yongfeng Zhang; Jon Carmack; Krzysztof Gofryk

doi:10.1016/j.jnucmat.2018.05.036

Thermal and transport properties of U₃Si₂

Daniel J. Antonio, Keshav Shrestha, Jason M. Harp, Cynthia A. Adkins, Yongfeng Zhang, Jon Carmack, Krzysztof Gofryk

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

We have studied U₃Si₂ by means of the heat capacity, electrical resistivity, Seebeck and Hall effects, and thermal conductivity in the temperature range 2–300 K and in magnetic fields up to 9 T. All the results obtained point to delocalized nature of 5f-electrons in this material. The low temperature heat capacity is enhanced (γ_el ∼ 150 mJ/mol-K²) and shows an upturn in C_p/T (T), characteristic of spin fluctuations. The thermal conductivity of U₃Si₂ is ∼8.5 W/m-K at room temperature and we show that the electronic part dominates heat transport above 300 K as expected for a metallic system, although the lattice contribution cannot be completely neglected.

Original language	English
Pages (from-to)	154-158
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	508
DOIs	https://doi.org/10.1016/j.jnucmat.2018.05.036
State	Published - Sep 2018
Externally published	Yes

Funding

This work was supported by Advanced Fuel Campaign and the DOE's Early Career Research Program . Y.Z. thanks the support of the Accident Tolerant Fuel high-impact-problem project under the DOE NEAMS program.

Funders	Funder number
Advanced Fuel Campaign
U.S. Department of Energy

Keywords

Electrical transport
Nuclear fuel
Thermal conductivity
USi
Uranium sesquisilicide

Access to Document

10.1016/j.jnucmat.2018.05.036

Cite this

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title = "Thermal and transport properties of U3Si2 ",

abstract = "We have studied U3Si2 by means of the heat capacity, electrical resistivity, Seebeck and Hall effects, and thermal conductivity in the temperature range 2–300 K and in magnetic fields up to 9 T. All the results obtained point to delocalized nature of 5f-electrons in this material. The low temperature heat capacity is enhanced (γel ∼ 150 mJ/mol-K2) and shows an upturn in Cp/T (T), characteristic of spin fluctuations. The thermal conductivity of U3Si2 is ∼8.5 W/m-K at room temperature and we show that the electronic part dominates heat transport above 300 K as expected for a metallic system, although the lattice contribution cannot be completely neglected.",

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author = "Antonio, {Daniel J.} and Keshav Shrestha and Harp, {Jason M.} and Adkins, {Cynthia A.} and Yongfeng Zhang and Jon Carmack and Krzysztof Gofryk",

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AU - Antonio, Daniel J.

AU - Shrestha, Keshav

AU - Harp, Jason M.

AU - Adkins, Cynthia A.

AU - Zhang, Yongfeng

AU - Carmack, Jon

AU - Gofryk, Krzysztof

PY - 2018/9

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AB - We have studied U3Si2 by means of the heat capacity, electrical resistivity, Seebeck and Hall effects, and thermal conductivity in the temperature range 2–300 K and in magnetic fields up to 9 T. All the results obtained point to delocalized nature of 5f-electrons in this material. The low temperature heat capacity is enhanced (γel ∼ 150 mJ/mol-K2) and shows an upturn in Cp/T (T), characteristic of spin fluctuations. The thermal conductivity of U3Si2 is ∼8.5 W/m-K at room temperature and we show that the electronic part dominates heat transport above 300 K as expected for a metallic system, although the lattice contribution cannot be completely neglected.

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