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Title: Thermophysical and mechanical properties of LaB₆ and CeB₆ synthesized through spark plasma sintering
Authors: Sun, Yifan
Ohishi, Yuji
Higaki, Junya
Muta, Hiroaki
Kurosaki, Ken  kyouindb  KAKEN_id  orcid (unconfirmed)
Author's alias: 孫, 一帆
黒﨑, 健
Keywords: Thermal conductivity
electrical conductivity
Vickers hardness
elastic properties
nuclear fuel
Issue Date: Nov-2023
Publisher: Taylor & Francis
Journal title: Journal of Nuclear Science and Technology
Volume: 60
Issue: 11
Start page: 1324
End page: 1332
Abstract: Following the Fukushima Daiichi nuclear power plant accident in 2011, the development of accident tolerant fuels (ATFs) has become an integral part of the promotion of nuclear safety. Of the many design criteria, a high thermal conductivity reduces a fuel pellet's peak temperature and radial temperature gradient. Although various uranium borides such as UB₂ and UB₄ are promising ATFs that have high-temperature stability, high uranium density, and good thermal conductivity, little is known about UB₆, as it has yet to be fabricated under normal conditions. As a metal hexaboride, UB₆ may have excellent electrical conductivity, likely giving it a much higher thermal conductivity than that of UO₂. In this work, we investigate the thermophysical and mechanical properties of non-radioactive LaB₆ and CeB₆ to estimate the potential properties of UB₆, as it has yet to be successfully fabricated. The thermophysical properties of UB₆ are compared with those of UO₂, UB₂, and UB₄ to help clarify whether future attempts at fabricating UB₆ under high pressure or with other dopants are worthwhile for the development of ATFs.
Rights: This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of Nuclear Science and Technology on 30 Mar 2023, available at:
The full-text file will be made open to the public on 30 Mar 2024 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
DOI(Published Version): 10.1080/00223131.2023.2192728
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