Simultaneous regulation of electrical and thermal transport properties in MnTe chalcogenides via the incorporation of p-type Sb2Te3

Basit, Abdul; Yang, Junyou; Jiang, Qinghui; Xin, Jingmin; Li, Xin; Li, Sihui; Li, Suwei; Long, Qiang

doi:10.1039/c8ta08830f

Cited by 23 publications

(28 citation statements)

References 27 publications

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“…The edge dislocations along with the secondary phases and nanoscale precipitates substantially contribute to the reduction in κ lat over a wide temperature range (Figure 6(C)). 98 Via the third process, high‐density dislocations with strains were realized in a Na‐Eu‐Sn co‐doped PbTe system 195,196 . An average strain of ~1.3% was obtained for the selected area of Na 0.03 Eu 0.03 Sn 0.02 Pb 0.92 Te by geometric phase analysis (Figure 6(D–G)) 195 .…”

Section: Extrinsic Sources For Slowing Down the Heat Transportmentioning

confidence: 98%

“…Dislocations can be simply produced by plastic deformation, introducing large amounts of point defects (vacancies or interstitials) via nonstoichiometric substitutions, and inducing numerous defects via multiple stoichiometric substitutions with different atomic sizes. The first method has been successfully applied to metals, 192 Bi 1‐x Sb x Te 3 , 75,76 and Bi 2 Te 1‐x Se x systems, 193 whereas the second process occurs in MnTe‐Sb 2 Te 3 , 98 PbSe‐Sb 2 Se 3 , 100 and Mg 2 Si 1‐ x Sb x 194 alloys. Typically, for MnTe‐Sb 2 Te 3 , in addition to the Sb 2 Te 3 secondary phase in the matrix, large amounts of edge dislocations were detected (Figure 6(A,B)) 98 .…”

Section: Extrinsic Sources For Slowing Down the Heat Transportmentioning

confidence: 99%

“…The first method has been successfully applied to metals, 192 Bi 1‐x Sb x Te 3 , 75,76 and Bi 2 Te 1‐x Se x systems, 193 whereas the second process occurs in MnTe‐Sb 2 Te 3 , 98 PbSe‐Sb 2 Se 3 , 100 and Mg 2 Si 1‐ x Sb x 194 alloys. Typically, for MnTe‐Sb 2 Te 3 , in addition to the Sb 2 Te 3 secondary phase in the matrix, large amounts of edge dislocations were detected (Figure 6(A,B)) 98 . The edge dislocations along with the secondary phases and nanoscale precipitates substantially contribute to the reduction in κ lat over a wide temperature range (Figure 6(C)).…”

Section: Extrinsic Sources For Slowing Down the Heat Transportmentioning

confidence: 99%

“…The heat in the lattice is carried by phonons of several modes and frequencies, and κ lat is the sum of all thermal conductivities 1 . Generally, to minimize κ lat of certain materials, extrinsic scattering centers of all‐scale and multidimensional defects can be simultaneously incorporated into the matrix 26,96–100 …”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Slowing down the heat in thermoelectrics

Qin

Wang

Zhao

2021

InfoMat

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Heat transport has various applications in solid materials. In particular, the thermoelectric technology provides an alternative approach to traditional methods for waste heat recovery and solid‐state refrigeration by enabling direct and reversible conversion between heat and electricity. For enhancing the thermoelectric performance of the materials, attempts must be made to slow down the heat transport by minimizing their thermal conductivity (κ). In this study, a continuously developing heat transport model is reviewed first. Theoretical models for predicting the lattice thermal conductivity (κlat) of materials are summarized, which are significant for the rapid screening of thermoelectric materials with low κlat. Moreover, typical strategies, including the introduction of extrinsic phonon scattering centers with multidimensions and internal physical mechanisms of materials with intrinsically low κlat, for slowing down the heat transport are outlined. Extrinsic defect centers with multidimensions substantially scatter various‐frequency phonons; the intrinsically low κlat in materials with various crystal structures can be attributed to the strong anharmonicity resulting from weak chemical bonding, resonant bonding, low‐lying optical modes, liquid‐like sublattices, off‐center atoms, and complex crystal structures. This review provides an overall understanding of heat transport in thermoelectric materials and proposes effective approaches for slowing down the heat transport to depress κlat for the enhancement of thermoelectric performance.

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Section: Extrinsic Sources For Slowing Down the Heat Transportmentioning

confidence: 98%

Section: Extrinsic Sources For Slowing Down the Heat Transportmentioning

confidence: 99%

Section: Extrinsic Sources For Slowing Down the Heat Transportmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Slowing down the heat in thermoelectrics

Qin

Wang

Zhao

2021

InfoMat

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“…[49] However, MnTe suffers from two properties, mainly low electrical conductivity and chemical instability, which can compromise its potential application as an efficient TE material. The poor electrical conductivity originates from both a low hole concentration (%10 18 cm À3 in comparison to the carrier concentration of 10 19 -10 21 cm À3 in typical TE tellurides) [49,52,53] and low carrier mobility due to the strong spin-disorder scattering. [54] The chemical and crystal structure instability is due to Te/Mn ion migration and Mn oxidation creating MnO and MnTe 2 impurity phases.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric, Magnetic, and Mechanical Characteristics of Antiferromagnetic Manganese Telluride Reinforced with Graphene Nanoplates

2020

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Mechanical and thermal stability are the two challenging aspects of thermoelectric compounds and modules. Microcrack formation during material synthesis and mechanical failure under thermo-mechanical loading is commonly observed in thermoelectric materials made from brittle semiconductors. Herein, the results of graphene-nanoplates (GNPs) reinforcement on the mechanical and thermoelectric properties of MnTe compound are reported. The binary antiferromagnetic MnTe shown promising thermoelectric characteristics due to the paramagnon-hole drag above the Néel temperature. In this study, different bulk MnTe samples are synthesized with the addition of GNPs in a small quantity (0.25-1 wt%) by powder metallurgy and spark plasma sintering. The thermoelectric factors, magnetic behavior, microstructure, and mechanical properties of the samples are evaluated and analyzed. Nearly 33% improvement is observed in the fracture toughness of MnTe reinforced with 0.25 wt% GNPs compared to the pristine structure. The Néel temperature remains approximately unaffected with the GNP inclusion; however, the low-temperature ferromagnetic phase impurity is significantly suppressed. The thermal conductivity and power factor decrease almost equally by %34% at 600 K; hence, the thermoelectric figure-of-merit is not affected by GNP reinforcement in the optimized sample.

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Multiple Valence Bands Convergence and Localized Lattice Engineering Lead to Superhigh Thermoelectric Figure of Merit in MnTe

et al. 2023

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MnTe has been considered a promising candidate for lead‐free mid‐temperature range thermoelectric clean energy conversions. However, the widespread use of this technology is constrained by the relatively low‐cost performance of materials. Developing environmentally friendly thermoelectrics with high performance and earth‐abundant elements is thus an urgent task. MnTe is a candidate, yet a peak ZT of 1.4 achieved so far is less satisfactory. Here, a remarkably high ZT of 1.6 at 873 K in MnTe system is realized by facilitating multiple valence band convergence and localized lattice engineering. It is demonstrated that SbGe incorporation promotes the convergence of multiple electronic valence bands in MnTe. Simultaneously, the carrier concentration can be optimized by SbGeS alloying, which significantly enhances the power factor. Simultaneously, MnS nanorods combined with dislocations and lattice distortions lead to strong phonon scattering, resulting in a markedly low lattice thermal conductivity(κlat) of 0.54 W m K−1, quite close to the amorphous limit. As a consequence, extraordinary thermoelectric performance is achieved by decoupling electron and phonon transport. The vast increase in ZT promotes MnTe as an emerging Pb‐free thermoelectric compound for a wide range of applications in waste heat recovery and power generation.

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Simultaneous regulation of electrical and thermal transport properties in MnTe chalcogenides via the incorporation of p-type Sb₂Te₃

Abstract: The thermoelectric performance of MnTe has been enhanced with the addition of Sb2Te3, which improves the ZT ∼77% at 873 K in 1.5 at% Sb2Te3 added MnTe sample.

Cited by 23 publications

References 27 publications

Slowing down the heat in thermoelectrics

Slowing down the heat in thermoelectrics

Thermoelectric, Magnetic, and Mechanical Characteristics of Antiferromagnetic Manganese Telluride Reinforced with Graphene Nanoplates

Multiple Valence Bands Convergence and Localized Lattice Engineering Lead to Superhigh Thermoelectric Figure of Merit in MnTe

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