[16p-D411-1~13] 9.4 Thermoelectric conversion

[16p-D411-13] Thermoelectric Properties of Ba₈Au_6−xFe_xGe₄₀ Clathrate

Yusuke Nakatani¹, Katsuaki Hashikuni¹, 〇Hiroaki Anno¹ (1.Sanyo-Onoda City Univ.)

Keywords:Clathrate, Thermoelectric conversion

To improve the thermoelectric performance of Ba₈Au₆Ge₄₀-based clathrates at high temperatures, we synthesized a new Ba₈Au_6−xFe_xGe₄₀(x=0−1) clathrate with Fe substituted for Au and investigated its thermoelectric properties. Compared with Ba₈Au₆Ge₄₀ (x=0), Ba₈Au_6−xFe_xGe₄₀ has a lower electrical conductivity but a higher Seebeck coefficient at high temperatures, and a maximum dimensionless thermoelectric figure of merit ZT of about 0.96 (about 791 K), indicating improved performance at high temperatures over previous studies of Ba₈Au₆Ge₄₀-based clathrates.