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주성재; 손지희; 장정인; 민복기; 김봉서
대한금속·재료학회지, 61(6), 06/2023Journal Article
Mg3Sb2-based materials are very promising for thermoelectric applications at low temperatures,and are strong candidates to replace n-type Bi2Te3 for cooling and power generation. Substituting Sb atomswith chalcogen elements (S, Se, Te) is a typical method of n-type doping, while doping the Mg site with Group3 elements (Y, Sc) and Lanthanides has also been studied. Unique advantages have been recently reported. In this study, a La-containing compound, LaSb, was used to fabricate n-type Mg3SbBi. The thermoelectricproperties of polycrystalline Mg3LaxSbBi (0 ≤ x ≤ 0.02) were investigated after synthesis by sequentialprocesses of arc melting, ball milling, and spark plasma sintering. Undoped Mg3SbBi is p-type with poorthermoelectric performance, and switched to n-type with La doping. The electron concentration of Mg3LaxSbBiincreased linearly with La content x, reaching up to 9.4 × 1019 cm-3 at x = 0.02. The power factor and the figureof merit were also maximized in Mg3La0.02SbBi, reaching 1.8 mW m-1K-2 (573 K) and 0.89 (623 K), respectively. The lattice thermal conductivity decreased with increasing La content above ~500 K, and the minimum valueof 0.73 W m-1K-1 was obtained in Mg3La0.02SbBi. This study shows that La doping using LaSb provides areliable method for n-type doping of Mg3Sb2-based materials. KCI Citation Count: 0
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