[19a-C103-1~12] 6.4 Thin films and New materials

▲ [19a-C103-3] Effects of strain on thermal conductivity of Fe₂VAl-based superlattice thin film

〇(PC)Seongho Choi¹, Satoshi Hiroi², Shunsuke Nishino¹, Manabu Inukai³, Dogyun Byeon¹, Masashi MiKami⁴, Tsunehiro Takeuchi¹ (1.Toyota Tech. Inst., 2.NIMS, 3.Nagoya Inst. Tech., 4.AIST Chubu)

Keywords:thermal conductivity, Fe2VAl, superlattice

Fe₂VAl-based compounds (L2₁-type Heusler phase) have been widely investigated as one of the most promising thermoelectric materials. All the constituent elements of Fe₂VAl-based compounds are non-toxic and abundant. Besides, good mechanical strength and strong resistance both for oxidation and corrosion let us believe that Fe₂VAl-based compounds are suitable for practical applications. Although its power factor reaches 5.5 mWm^-1K^-2 which is even larger than that of Bi₂Te₃-based thermoelectric materials, the figure of merit is still much less than unity due to the high thermal conductivity. Thus, we tried to fabricate the artificial superlattice thin film to effectively reduce the thermal conductivity. In the present study, we intended to identify the phonon scattering mechanism in the Fe₂VAl-based thin films.