New Zintl Phase Yb10MgSb9 with High Thermoelectric Performance

Yb10MgSb9 is a new Zintl compound (with a composition closer to Yb10.5MgSb9) and a promising thermoelectric material first reported in this work. Undoped Yb10MgSb9 has an ultralow thermal conductivity due to crystallographic complexity and exhibits a relatively high peak p‐type Seebeck coefficient a...

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Veröffentlicht in:Advanced energy materials 2023-05, Vol.13 (19), p.n/a
Hauptverfasser: Borgsmiller, Leah, Li, Qingyuan, Toriyama, Michael Y., Snyder, G. Jeffrey
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Sprache:eng
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Zusammenfassung:Yb10MgSb9 is a new Zintl compound (with a composition closer to Yb10.5MgSb9) and a promising thermoelectric material first reported in this work. Undoped Yb10MgSb9 has an ultralow thermal conductivity due to crystallographic complexity and exhibits a relatively high peak p‐type Seebeck coefficient and high electrical resistivity. This is consistent with Zintl counting and density functional theory (DFT) calculations that the composition Yb10.5MgSb9 should be a semiconductor. Na is found experimentally to be an effective p‐type dopant potentially due to the replacement of Na+ for Yb2+, allowing for a significant decrease in electrical resistivity. With doping, a dramatic improvement of electrical conductivity is observed and the glass‐like thermal conductivity remains low, allowing for a significant enhancement of the thermoelectric figure of merit, zT. Doping increases the zT from 0.23 in undoped Yb10MgSb9 to 1.06 in 7 at% Na‐doped Yb10MgSb9 at 873K. This high thermoelectric performance found through Na‐doping places this material amongst the leading p‐type Zintl thermoelectrics, making it a promising candidate for future studies and high‐temperature thermoelectric applications. High‐temperature thermoelectrics are necessary for space applications, and Zintl phases are amongst some of the best materials for these applications. Here, a new Zintl phase, Yb10MgSb9 (with a composition closer to Yb10.5MgSb9) is reported for the first time and demonstrates high thermoelectric performance upon doping due to its high Seebeck coefficient and ultralow thermal conductivity.
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.202300393