New Zintl Phase Yb 10 MgSb 9 with High Thermoelectric Performance
Yb 10 MgSb 9 is a new Zintl compound (with a composition closer to Yb 10.5 MgSb 9 ) and a promising thermoelectric material first reported in this work. Undoped Yb 10 MgSb 9 has an ultralow thermal conductivity due to crystallographic complexity and exhibits a relatively high peak p‐type Seebeck coe...
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Veröffentlicht in: | Advanced energy materials 2023-05, Vol.13 (19) |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Yb
10
MgSb
9
is a new Zintl compound (with a composition closer to Yb
10.5
MgSb
9
) and a promising thermoelectric material first reported in this work. Undoped Yb
10
MgSb
9
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 Yb
10.5
MgSb
9
should be a semiconductor. Na is found experimentally to be an effective p‐type dopant potentially due to the replacement of Na
+
for Yb
2+
, 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 Yb
10
MgSb
9
to 1.06 in 7 at% Na‐doped Yb
10
MgSb
9
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. |
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ISSN: | 1614-6832 1614-6840 |
DOI: | 10.1002/aenm.202300393 |