Comprehensive investigation of lattice dynamics of neutron multiplier beryllides: vibrational spectra and thermal performances

Abstract In order to realize tritium self-sufficiency during the operation of fusion reactors, neutron multiplier materials are needed multiply number neutrons. Beryllium (Be) and beryllides (Be 12 V, Be Ti) considered as candidates for in breeding blanket. Thermal performances essential data evaluate service performance future reactors. Due toxicity beryllium, preparation analysis challenging. As a result, limited. It is adopt theoretical method get basic parameters design blanket optimization multiplier. present work, electron structure, vibrational spectra, thermal have been theoretically investigated understand expansion conductivity properties. Experimental also included compare with calculated results detailed presented. reactivity water, BeO will form on surface Be. Therefore, was studied well. The bulk modulus smallest four materials, while largest. Higher has better ability restrain deformation due pressure. c -axis V largest coefficient, Ti smallest. found that larger lattice constant crystal axes, smaller linear coefficient same material. Electrons play major role heat transfer Ti. At high temperatures, phonon coupling must be considered. Isotopeenrichment enlarging grain size cannot significantly improve when temperature higher than room temperature. values can adopted predict materials’ support reactors’ material preparation.