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The dimensionless gure of merit, ZT, of Al-Mn-Si based C54 phase was effectively increased using the precipitation of a small amount of Al-Mn-Si based C40 phase, which possesses slightly smaller magnitude of both electrical resistivity and Seebeck coef cient than those of C54 phase. We prepared a series of samples by simply alloying Al37(Mn26Ru3Re3Fe1)Si30) C54 phase and Al27.5(Mn29W3Fe1)Si39.5 C40 phase as [Al37(Mn26Ru3Re3Fe1)Si30]1-x[Al27.5(Mn29W3Fe1)Si39.5]x at x = 0, 0.01, 0.02, 0.03, 0.05, and 1, and found that the magnitude of Seebeck coef cient remained unchanged at x < 0.03, while the lattice thermal conductivity and electrical resistivity were moderately decreased with increasing x. The maximum ZT has consequently increased up to ZT = 0.42 at x = 0.03 from ZT = 0.38 of the C54-phase at x = 0. [doi:10.2320/matertrans.MF201613]

Thermoelectric Properties of Al-Mn-Si Based C54 Phase Containing Small Amount of C40 Phase