[16p-WL2_401-1~15] 9.4 Thermoelectric conversion

3:45 PM - 4:00 PM JST(6:45 AM - 7:00 AM UTC)

[16p-WL2_401-9] Structural Control and Thermoelectric Property Evaluation of Weathered Biotite–Based Thermoelectric Materials via Molten Salt Treatment

〇Mitsunori Honda¹, Kosetsu Hayakawa^1,2, Yumeno Masebo², Masakazu Muraguchi², Rina Yabuta³, Masato Oda³, Hiroyuki Ishii⁴ (1.JAEA Pioneer Lab, 2.Hokkaido Univ. of Sci, 3.Wakayama Univ., 4.Univ. of Tsukuba)

Keywords:

clay minerals,thermoelectric materials,structure control

With the aim of developing sustainable thermoelectric materials based on earth-abundant clay minerals, molten salt treatment was applied to weathered biotite (WB) using a KCl-CaCl2 (3:1) mixture. By controlling particle size and compaction conditions, a pronounced enhancement in electrical conductivity was observed for samples with particle sizes in the range of 45-75 um. In contrast, thermal conductivity tended to be governed by macroscopic structural factors such as grain boundary structure and packing density. Correlation with structural analysis further suggests that interlayer ion migration contributes to electrical conduction in the high-temperature region.