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Article: Mechanical alloying boosted SnTe thermoelectrics

TitleMechanical alloying boosted SnTe thermoelectrics
Authors
KeywordsThermoelectric materials
SnTe
Hierarchical microstructures
Interfacial engineering
Mechanical alloying
Issue Date2021
PublisherElsevier Ltd. The Journal's web site is located at http://www.journals.elsevier.com/materials-today-physics
Citation
Materials Today Physics, 2021, v. 17, p. article no. 100340 How to Cite?
AbstractThe well converged transporting valence bands in SnTe-MnTe alloys ensures a superior electronic performance, while their thermal transport properties still need to be further optimized for higher thermoelectric performance. Herein, the mechanical alloying is utilized to fabricate the SnTe-15%MnTe-2%Bi alloys, leading to a remarkable reduction of grain size as well as the formation of dense dislocations. Unexpectedly, the solubility of MnTe is reduced to ∼6% by mechanical alloying at room temperature, inducing an enhanced phonon scattering from nanoprecipitates. These full-scale hierarchical microstructures effectively decrease the lattice thermal conductivity of SnTe-15%MnTe-2%Bi to ∼0.5 W m−1 K−1 at 850 K. In addition, the increased vacancy formation energy triggers a reduction in carrier concentration (∼3 × 1019 cm−3) due to the decreased MnTe content in matrix. Moreover, the energy filtering effect through precipitate-matrix interface enables an improvement in Seebeck coefficient. Accordingly, the figure of merit of SnTe-15%MnTe-2%Bi is dramatically increased to ∼1.5 at 850 K by mechanical alloying. This work clearly demonstrates that mechanical alloying changes the composition and microstructure of materials, which significantly affect the thermoelectric transport properties, enabling an obvious performance enhancement.
Persistent Identifierhttp://hdl.handle.net/10722/300596
ISSN
2020 Impact Factor: 9.298
2020 SCImago Journal Rankings: 2.878

 

DC FieldValueLanguage
dc.contributor.authorChen, Z-
dc.contributor.authorSun, Q-
dc.contributor.authorZhang, F-
dc.contributor.authorMAO, J-
dc.contributor.authorChen, Y-
dc.contributor.authorLi, M-
dc.contributor.authorChen, ZG-
dc.contributor.authorAng, R-
dc.date.accessioned2021-06-18T14:54:16Z-
dc.date.available2021-06-18T14:54:16Z-
dc.date.issued2021-
dc.identifier.citationMaterials Today Physics, 2021, v. 17, p. article no. 100340-
dc.identifier.issn2542-5293-
dc.identifier.urihttp://hdl.handle.net/10722/300596-
dc.description.abstractThe well converged transporting valence bands in SnTe-MnTe alloys ensures a superior electronic performance, while their thermal transport properties still need to be further optimized for higher thermoelectric performance. Herein, the mechanical alloying is utilized to fabricate the SnTe-15%MnTe-2%Bi alloys, leading to a remarkable reduction of grain size as well as the formation of dense dislocations. Unexpectedly, the solubility of MnTe is reduced to ∼6% by mechanical alloying at room temperature, inducing an enhanced phonon scattering from nanoprecipitates. These full-scale hierarchical microstructures effectively decrease the lattice thermal conductivity of SnTe-15%MnTe-2%Bi to ∼0.5 W m−1 K−1 at 850 K. In addition, the increased vacancy formation energy triggers a reduction in carrier concentration (∼3 × 1019 cm−3) due to the decreased MnTe content in matrix. Moreover, the energy filtering effect through precipitate-matrix interface enables an improvement in Seebeck coefficient. Accordingly, the figure of merit of SnTe-15%MnTe-2%Bi is dramatically increased to ∼1.5 at 850 K by mechanical alloying. This work clearly demonstrates that mechanical alloying changes the composition and microstructure of materials, which significantly affect the thermoelectric transport properties, enabling an obvious performance enhancement.-
dc.languageeng-
dc.publisherElsevier Ltd. The Journal's web site is located at http://www.journals.elsevier.com/materials-today-physics-
dc.relation.ispartofMaterials Today Physics-
dc.subjectThermoelectric materials-
dc.subjectSnTe-
dc.subjectHierarchical microstructures-
dc.subjectInterfacial engineering-
dc.subjectMechanical alloying-
dc.titleMechanical alloying boosted SnTe thermoelectrics-
dc.typeArticle-
dc.identifier.emailChen, Y: yuechen@hku.hk-
dc.identifier.authorityChen, Y=rp01925-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.mtphys.2021.100340-
dc.identifier.scopuseid_2-s2.0-85099353742-
dc.identifier.hkuros322982-
dc.identifier.volume17-
dc.identifier.spagearticle no. 100340-
dc.identifier.epagearticle no. 100340-
dc.publisher.placeUnited Kingdom-

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