[2L04-07] Tritium Breeding Materials/Neutron-Multiplier Materials

[2L07] Evaluation of thermal expansion anisotropy in beryllium intermetallics

*Keisuke Mukai¹ (1. Kyoto Univ.)

Keywords:Blanket, Nuclear fusion, Beryllium, Neutron multiplier

Be₁₂Ti and Be₁₂V are promising candidates for neutron multipliers in solid breeding blankets, which is used in a bulk form to achieve the fuel tritium self-sufficiency. Previously, significant anisotropic thermal expansions were predicted for Be₁₂Ti and Be₁₂V along different crystallographic axes using density functional theory (DFT) calculations. Nevertheless, empirical confirmation through experimental data on thermal expansion anisotropy remains lacking. In this study, the thermal expansion behaviors of these materials were experimentally investigated by using high-temperature X-ray diffraction. Diffraction data were collected temperatures up to 873 K under vacuum condition, and structural refinement was carried out by Le Bail analysis using a partial structure.