Effect of oxygen defects on thermal conductivity of thorium-cerium dioxide solid solutions

被引：5

作者：

Muta, Hiroaki ^{[1
]}

Kado, Hirohisa ^{[1
]}

Ohishi, Yuji ^{[1
]}

Kurosaki, Ken ^{[1
]}

Yamanaka, Shinsuke ^{[1
,2
]}

机构：

[1] Osaka Univ, Grad Sch Engn, Suita, Osaka 5650871, Japan

[2] Univ Fukui, Res Inst Nucl Engn, Fukui 9108507, Japan

来源：

JOURNAL OF NUCLEAR MATERIALS | 2017年 / 483卷

关键词：

Thorium oxide; Thermal conductivity; Oxygen defect; Ionic radius; THERMOPHYSICAL PROPERTIES; IMPERFECTIONS; TEMPERATURES; DISSOLUTION; TRANSPORT; FUEL; MOX;

D O I：

10.1016/j.jnucmat.2016.10.043

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Thermal conductivity of thorium-cerium dioxide solid solutions has been measured and analyzed using the relaxation time approximation. Despite the presence of oxygen defects, the partially reduced Th0.8Ce0.2O1.97 exhibited higher thermal conductivity than the stoichiometric one, Th0.8Ce0.2O2.00, showing the same tendency as that previously reported for Th0.7Pu0.3O2-delta. The increase in thermal conductivity with the oxygen defects can be explained by assuming that cerium ions have an average ionic radius of the ionic radii of Ce3+ and Ce4+ in the description of phonon impurity scattering. This result indicates that the small reduction of (Th,Pu)O2-delta fuel increases the thermal conductivity, especially at high temperatures. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：192 / 198

页数：7

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