Isotope Effects on Thermal Conductivity of Boron Carbide
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概要
- 論文の詳細を見る
The isotopically enriched disk samples of 10B412C, (10B0.7511B0.25)412C, (10B0.2011B0.80)412C, 10B413C, 10B4(12C0.5013C0.50), 11B4(12C0.5013C0.50), 11B412C, 11B413C and natural nB4nC were prepared by the spark plasma sintering method. The thermal diffusivity for each sample was measured by the laser flash method over the temperature range from 290 to 1,450 K. The isotope effects on the thermal conductivities, which were calculated from the measured thermal diffusivities, the heat capacity for natural B4C and densities, were discussed in terms of the phonon-velocity and the scattering probability of phonon by isotopic impurity. The thermal conductivity decreased only with increasing the mean mass of boron. In the single-atom model, the phonon-velocity decreases with increasing the mass of atoms. The thermal conductivity obtained in this study was seen to be independent on the scattering probability of phonon by isotopic impurity, but to depend on the phonon-velocity. Isotope effects are thought to be difficult to detect in polycrystalline boron carbide.
- 社団法人 日本原子力学会の論文
- 2002-04-25
著者
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NAGASAKI Takanori
EcoTopia Science Institute, Nagoya University
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ARITA Yuji
EcoTopia Science Institute, Nagoya University
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MATSUI Tsuneo
Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya Univ
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Arita Yuji
Ecotopia Science Institute Nagoya University
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Matsui Tsuneo
Department Of Materials Physics And Energy Engineering Graduate School Of Engineering Nagoya Univers
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NISHI Yoshimasa
Department of Quantum Engineering, Graduate School of Engineering, Nagoya University
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ARITA Yuji
Research Center for Nuclear Materials Recycle, Nagoya University
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NAGASAKI Takanori
Department of Quantum Engineering, Graduate School of Engineering, Nagoya University
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Nagasaki Takanori
Department Of Quantum Engineering And Department Of Nuclear Engineering Graduate School Of Engineeri
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Nishi Yoshimasa
Department Of Quantum Engineering Graduate School Of Engineering Nagoya University
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