[15a-E206-1~12] 9.4 Thermoelectric conversion

△ [15a-E206-5] Thermoelectric and structural properties of melt grown Zn₄Sb₃

〇(M1)Aisaku Yokoyama¹, Kei Hayashi¹, Kentaro Ishii¹, Tomohisa Takamatsu¹, Yuzuru Miyazaki¹ (1.Tohoku Univ.)

Keywords:Thermoelectric conversion, Zn4Sb3

In this work, we fabricated melt-grown β-Zn₄Sb₃ to enhance thermoelectric properties. The melt β-Zn₄Sb₃ ingots contained cracks, therefore, we optimized fabrication condition to prepare crack-free β-Zn₄Sb₃ ingots. First, starting materials Zn and Sb were melted at 923 K, and then annealed at 723 K. Cooling rate from melting to annealing was varied (2, 10, 20, 100 K/h). As a result we achieved high ZT = 0.93 at 500 Kin the case of 100 K/h.