[21a-W323-1~10] 9.4 Thermoelectric conversion

△ [21a-W323-5] Thermoelectric properties of V-doped MnSi_γ synthesized by solution growth

〇(M1)HARUKI HAMADA¹, Kei Hayashi¹, Yuzuru Miyazaki¹ (1.Tohoku Univ.)

Keywords:Thermoelectrics,Higher Manganese Silicides

MnSi_γ is known as a p-type thermoelectric material. In general, MnSi_γ synthesized by solution growth has layered MnSi precipitates perpendicular to c-axis, and such the precipitates work as defects and deteriorate electrical conductivity. In the present study, we have discovered that the V-substitution for Mn sites dissipates the precipitates in bulk MnSi_γ and hence significantly improve the thermoelectric power factor, from 1.12 W/mK^-2 (x=0) to 2.33 W/mK^-2 (x=0.02) at 900K, of MnSi_γ.