[25a-12C-1~9] 1.4 Energy conversion, storage, resources and environment

9:00 AM - 9:15 AM JST(12:00 AM - 12:15 AM UTC)

[25a-12C-1] Fabrication of eco-friendly thermoelectric materials using Fukushima Weathered Biotite by molten salt treatment

〇Mitsunori Honda¹, Yui Kaneta¹, Masakazu Muraguchi², Kosetsu Hayakawa^2,1, Masato Oda³, Chiaki Iino³, Hiroyuki Ishii⁴, Takuya Goto⁵ (1.JAEA MS, 2.Hokkaido Univ. of Sci., 3.Wakayama Univ., 4.Univ. of Tsukuba, 5.Doshisha Univ.)

Keywords:

weathered biotite,molten salt treatment,Thermoelectric conversion materials

Our research focuses on the use of weathered biotite (WB) as an alternative material to thermoelectric materials, which have traditionally been made from rare and toxic elements. After WB was crushed and classified, crystals with conductivity comparable to that of Si semiconductors in the temperature range of 650-850°C were obtained by heat treatment using the molten salt method. In this study, we report on the results of the dimensionless evaluation index ZT calculated from the conductivity, Seebeck coefficient, and thermal diffusion measurements in the high temperature range, and the thermal conductivity calculated from the specific heat and specific gravity.