A low-temperature thermoelectric transport study of non-stoichiometric AgSbTe 2
In recent times, considerable attention has been given to examining the impact of micro/nanostructure on the thermoelectric characteristics of nonstoichiometric AgSbTe . The present investigation employed direct melting of elements that produced p-type AgSbTe with spontaneous nanostructuring due to...
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Published in | Physical chemistry chemical physics : PCCP |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
England
29.05.2024
|
Online Access | Get full text |
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Summary: | In recent times, considerable attention has been given to examining the impact of micro/nanostructure on the thermoelectric characteristics of nonstoichiometric AgSbTe
. The present investigation employed direct melting of elements that produced p-type AgSbTe
with spontaneous nanostructuring due to cation ordering. The product predominantly features an Ag-deficient Ag
Sb
Te
phase with monoclinic Ag
Te nanoprecipitates and exhibits a degenerate semiconductor-like behavior with an energy band gap of 0.15 eV. A Seebeck coefficient of 251 μV K
and a power factor of 741 μW m
K
at near ambient temperature are attained with this composition. The variable range hopping (VRH) and linear magnetoresistance (LMR) confirmed that the low-temperature transport followed a VRH between the localized states. The composition also exhibited glass like thermal conductivity of 0.2 W m
K
arising from phonon scattering at all-scale hierarchical structures that led to a high
of 1.1 at room temperature. The direct melted ingots show a high relative density of ∼97%, Vickers hardness
of ∼108.5 kgf mm
, and excellent thermal stability, making them an attractive choice for TEGs. |
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ISSN: | 1463-9076 1463-9084 |
DOI: | 10.1039/D4CP01171F |