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

△ [15a-E206-8] Effect of elemental substitution on thermal stability and thermoelectric properties of Chimney-ladder phase FeGe_γ

〇Naoki Sato¹, Hideyasu Ouchi¹, Koichi Kitahara¹, Yoshiki Takagiwa², Yukari Katsura¹, Kaoru Kimura¹ (1.Univ. Tokyo, 2.NIMS)

Keywords:thermoelectric material, Chimney-ladder phase

Chimney-ladder phase FeGe_γ, which has incommensurate Fe and Ge sublattices, exhibits high ZT value of 0.57 at about 600 K. However, it decomposes above 853 K. Here we will report an effect of elemental substitution for the transition metal site on thermal stability, crystal structure, and thermoelectric properties.