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

40 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.

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.",

keywords = "Electrical transport, Nuclear fuel, Thermal conductivity, USi, Uranium sesquisilicide",

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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year = "2018",

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doi = "10.1016/j.jnucmat.2018.05.036",

language = "English",

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journal = "Journal of Nuclear Materials",

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TY - JOUR

T1 - Thermal and transport properties of U3Si2

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

Y1 - 2018/9

N2 - 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.

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.

KW - Electrical transport

KW - Nuclear fuel

KW - Thermal conductivity

KW - USi

KW - Uranium sesquisilicide

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