Isotope effect and hydrogen content dependence on the heat capacity and thermal conductivity of zirconium hydride and deuteride |
| |
| Authors: | Ken Kurosaki Naoto Fujiura Yuji Ohishi Hiroaki Muta Shinsuke Yamanaka |
| |
| Affiliation: | 1. Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan;2. Research Institute of Nuclear Engineering, University of Fukui, 1-2-4 Kanawacho, Tsuruga, Fukui 914-0055, Japan |
| |
| Abstract: | Zirconium (Zr) hydride and deuteride are considered as candidates of neutron reflector materials in fast reactors (FRs). Thus, it is important to evaluate their fundamental physical and chemical properties. In this study, we prepared ?-phase Zr deuteride (?-ZrD1.90), whose physical properties have been investigated and also the heat capacity (CP) and thermal conductivity (κ) have been measured from room temperature to 673 K. The obtained data were compared with the literature data of δ-phase Zr hydride (δ-ZrH1.66), ?-phase Zr hydride (?-ZrH1.94), and deuteride (?-ZrD1.95). Both CP and κ of ?-ZrD1.90 were higher than those of δ-ZrH1.66. The higher CP of ?-ZrD1.90 than that of δ-ZrH1.66 is mainly due to the smaller vibration frequency of deuterium atoms than that of hydrogen atoms. On the other hand, the higher κ of ?-ZrD1.90 than that of δ-ZrH1.66 is due to the larger hydrogen isotope content of ?-ZrD1.90 than that of δ-ZrH1.66. The data reported here would be useful when Zr hydride and deuteride are installed into FRs. |
| |
| Keywords: | zirconium deuteride zirconium hydride neutron reflector fast reactor thermal property heat capacity thermal conductivity |
|
|
