講演情報
[22a-B203-2]Thermoelectric properties of β-FeSi2 with Co and Ni addition
〇(DC)Sopheap Sam1, Hiroshi Nakatsugawa1, Yoichi Nakatsugawa2 (1.Yokohama National Univ., 2.National Defense Academy)
キーワード：
Thermoelectric properties、Silicides、ZT value
We attempt to improve the carrier mobility of Co-doped β-FeSi2 by Ni addition. The effect of dopants on the structural, electrical, and thermoelectric properties is investigated. The result shows that the metallic ε-phase increases with Ni and the solubility of Ni for β-phase is 1%. The presence of the ε-phase decreases the solubility of both Co and Ni in the β-phase. As Ni is added, the Seebeck coefficient decreases because of the formation of the ε-phase. At high temperatures, the ρ decreases with Ni doping because of the improved mobility. The thermal conductivity slightly decreases with Ni probably due to the porosity. As a result, the highest ZT value of 0.31 is obtained in the 1% Ni-substituted sample.