| Autor: |
IWASAKI, Kouta, MATSUI, Tsuneo, YANAI, Koichi, YUDA, Ryouichi, ARITA, Yuji, NAGASAKI, Takanori, YOKOYAMA, Noboru, TOKURA, Ichiro, UNE, Katsumi, HARADA, Kenichi |
| Zdroj: |
Journal of Nuclear Science and Technology; July 2009, Vol. 46 Issue: 7 p673-676, 4p |
| Abstrakt: |
10 wt% Gd2O3-dispersed UO2pellets, in which Gd2O3particles are dispersed in UO2matrix, were prepared, and the thermal conductivity was investigated. The Gd2O3-dispersed UO2pellets consisted of Gd2O3, UO2, and a Gd—U—O phase that was formed by diffusion of U ions into Gd2O3particles during the sintering process. In addition, pores were mainly distributed at the boundary between the Gd2O3particles and the UO2matrix. The thermal conductivity of 10 wt% Gd2O3-dispersed UO2decreased with temperature (5.8–2.7Wm−1K−1from 300 to 1273 K) and was larger than that of (U,Gd)O2solid solutions (3.8–2.6Wm−1K1) with the same Gd2O3content. The increase in the thermal conductivity by Gd2O3dispersion was attributable to the reduction in phonon-point defect scattering in the UO2matrix. Dispersion of Gd2O3particles was effective in improving the thermal conductivity of Gd2O3–UO2fuel pellets. |
| Databáze: |
Supplemental Index |
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