[17p-Z17-1~19] 9.4 熱電変換

▼ [17p-Z17-12] The Crystal Structures and Thermoelectric Properties of Ag-doped Mg₂Sn

〇Zhicheng Huang¹、Kei Hayashi¹、Wataru Saito¹、Yuzuru Miyazaki¹ (1.Tohoku Univ.)

キーワード：thermoelectric, Mg2Sn

Thermoelectric (TE) materials, which can directly convert waste heat into electricity, are expected to play a significant role in future energy utilization. Mg₂Sn is a promising mid-temperature TE material consisting of earth-abundant, low cost, and less-toxic elements. In this work, Ag-doped Mg₂Sn ingots with V_Mg were prepared by the melting method, whose morphology and TE properties were investigated with a particular emphasis on effects of doped Ag atoms and V_Mg. The maximum PF (PF_max = 1.5 mW·m^-1·K^-2) was achieved for Mg_1.99Ag_0.01Sn at 300 K, and the PF decreased with the temperature increased. This may be due to the influences of the secondary phase in the Mg_1.99Ag_0.01Sn ingots. We will try to prepare Mg_2(1-x)Ag_2xSn single crystal by controlling the cooling rate during preparation, and investigate their V_Mg fraction, carrier concentration, and TE properties, which will be reported in the presentation.