Large ZT enhancement in hot forged nanostructured p-type Bi0.5Sb1.5Te3 bulk alloys

Jiang, Qinghui; Yan, Haixue; Khaliq, Jibran; Ning, Huanpo; Grasso, Salvatore; Simpson, Kevin; Reece, Michael J.

doi:10.1039/c3ta13952b

Cited by 69 publications

(49 citation statements)

References 41 publications

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“…[80] According to solid state physical principles, the ZT value for bulk mate rials with a single parabolic band (SPB) along a certain direc tion can be given as: [4] The timeline for thermoelectric bulk materials with 2D structures, showing data from a superlattice, [8] SnSe, [11,[19][20][21] Bi 2 Te 3 , [12,14,16,17,[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] BiCuSeO, [12,[42][43][44][45][46][47][48][49][50][51][52][53][54][55][56] Na x CoO 2 , [57,58] Ca 3 Co 4 O 9 , [5...…”

Section: Strategies From Artificial Superlatticesmentioning

confidence: 99%

Promising Thermoelectric Bulk Materials with 2D Structures

2017

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Given that more than two thirds of all energy is lost, mostly as waste heat, in utilization processes worldwide, thermoelectric materials, which can directly convert waste heat to electricity, provide an alternative option for optimizing energy utilization processes. After the prediction that superlattices may show high thermoelectric performance, various methods based on quantum effects and superlattice theory have been adopted to analyze bulk materials, leading to the rapid development of thermoelectric materials. Bulk materials with two‐dimensional (2D) structures show outstanding properties, and their high performance originates from both their low thermal conductivity and high Seebeck coefficient due to their strong anisotropic features. Here, the advantages of superlattices for enhancing the thermoelectric performance, the transport mechanism in bulk materials with 2D structures, and optimization methods are discussed. The phenomenological transport mechanism in these materials indicates that thermal conductivities are reduced in 2D materials with intrinsically short mean free paths. Recent progress in the transport mechanisms of Bi2Te3‐, SnSe‐, and BiCuSeO‐based systems is summarized. Finally, possible research directions to enhance the thermoelectric performance of bulk materials with 2D structures are briefly considered.

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Section: Strategies From Artificial Superlatticesmentioning

confidence: 99%

Promising Thermoelectric Bulk Materials with 2D Structures

2017

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“…Conventional thermoelectric materials, like Bi 2 Te 3 , skutterudites, and PbTe are classed as efficient thermoelectric materials. Bi 2 Te 3 related compounds have a maximum efficiency near room temperature 3 and comparatively low operating temperatures (<200 C), while skutterudites and PbTe are classed as intermediate temperature thermoelectrics (up to 650 C). [4][5][6][7][8] These materials are being used in large scale applications but they have high processing costs 9 and use toxic elements.…”

Section: Introductionmentioning

confidence: 99%

Reduced thermal conductivity by nanoscale intergrowths in perovskite like layered structure La2Ti2O7

Khaliq

Chen

et al. 2015

Journal of Applied Physics

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The effect of substitution and oxidation-reduction on the thermal conductivity of perovskite-like layered structure (PLS) ceramics was investigated in relation to mass contrast and non-stoichiometry. Sr (acceptor) was substituted on the A site, while Ta (donor) was substituted on the B site of La 2 Ti 2 O 7 . Substitution in PLS materials creates atomic scale disorders to accommodate the non-stoichiometry. High resolution transmission electron microscopy and X ray diffraction revealed that acceptor substitution in La 2 Ti 2 O 7 produced nanoscale intergrowths of n ¼ 5 layered phase, while donor substitution produced nanoscale intergrowths of n ¼ 3 layered phase. As a result of these nanoscale intergrowths, the thermal conductivity value reduced by as much as $20%. Pure La 2 Ti 2 O 7 has a thermal conductivity value of $1.3 W/m K which dropped to a value of $1.12 W/m K for Sr doped La 2 Ti 2 O 7 and $0.93 W/m K for Ta doped La 2 Ti 2 O 7 at 573 K. V C 2015 AIP Publishing LLC.

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“…7. 42 BiCuSeO, a layered ZrSiCuAs-like structure, is composed of alternately stacked (Bi 2 O 2 Þ 2þ insulating layers and (Cu 2 Se 2 Þ 2À conducting layers along the c-axis, whose ZT value is highest among oxygen containing materials, as shown in Fig. 8.…”

Section: Microstructure Tailoringmentioning

confidence: 99%

“…This method, also called as mechanical alloying, already successfully produces almost all TE powders. 41,42 In this process, the reaction can go on without high temperature environment. The powders are flattened from the collision of the balls and this micro-forging leads to plastic deformation.…”

Section: A Top-bottom Approachmentioning

confidence: 99%

“…5, these techniques will be discussed in detail). 42,56 During hot forging process, the initial forged temperature should be confirmed carefully, else preferred orientation cannot be successfully achieved. Rapid superplastic deformation can lead to the sliding and alignment of the nanograins perpendicular to the pressing direction.…”

Section: Microstructure Tailoringmentioning

confidence: 99%

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Microstructure tailoring in nanostructured thermoelectric materials

et al. 2016

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Progresses in thermoelectric (TE) materials will contribute to solving the world's demands for energy and global climate protection. It also calls for higher ZT to achieve ideal commercial conversion efficiency. As an effective way, nanostructuring can reduce the thermal conductivity by the selective scattering of phonons or enhance Seebeck coefficient via modification of the density of the states, resulting in good ZT value. Meanwhile, TE properties of nanostructured materials should depend on the size and morphology of the microstructure features. This review emphasizes the developments in the TE bulk materials at the nanoscale in the past several years and summarizes the understanding in this active field.

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Large ZT enhancement in hot forged nanostructured p-type Bi_0.5Sb_1.5Te₃ bulk alloys

Abstract: Large ZT enhancement (50%) is obtained in hot forged nanostructured p-type Bi0.5Sb1.5Te3 bulk alloys.

Cited by 69 publications

References 41 publications

Promising Thermoelectric Bulk Materials with 2D Structures

Promising Thermoelectric Bulk Materials with 2D Structures

Reduced thermal conductivity by nanoscale intergrowths in perovskite like layered structure La2Ti2O7

Microstructure tailoring in nanostructured thermoelectric materials

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