Enhanced thermoelectric and mechanical properties in textured n-type Bi2Te3 prepared by spark plasma sintering

Zhao, Li‐Dong; Zhang, B.-P.; Li, J.-F.; Zhang, Hailong; Liu, Weishu

doi:10.1016/j.solidstatesciences.2007.10.022

Cited by 245 publications

(161 citation statements)

References 36 publications

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“…The application of the load can also result in texturing if elongated grains are used or form during densification. [39,40] This process is similar to the observed texturing during HP. By increasing the pressure in FAST/SPS up to several hundreds of MPa, powder agglomerates may break.…”

Section: Mechanical Effectssupporting

confidence: 76%

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

et al. 2014

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Field-assisted sintering technology/Spark plasma sintering is a low voltage, direct current (DC) pulsed current activated, pressure-assisted sintering, and synthesis technique, which has been widely applied for materials processing in the recent years. After a description of its working principles and historical background, mechanical, thermal, electrical effects in FAST/SPS are presented along with the role of atmosphere. A selection of successful materials development including refractory materials, nanocrystalline functional ceramics, graded, and non-equilibrium materials is then discussed. Finally, technological aspects (advanced tool concepts, temperature measurement, finite element simulations) are covered.

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Section: Mechanical Effectssupporting

confidence: 76%

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

et al. 2014

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“…Indeed, the lattice thermal conductivity of TP 460 was lower than the non-TP sample. Our previous study 26 found that the thermal conductivity of textured Bi 2 Te 3 samples was also dependent on the texturing temperature. The reason why the lowest lattice thermal conductivity was obtained in TP 460 strongly correlates to the following finding about the texturing induced nanoscale inhomogeneity.…”

Section: Thermoelectric Propertiesmentioning

confidence: 96%

“…In this work, highly textured n-type Bi 2 (TeSe) 3 alloys were fabricated by a repeated SPS process as hot-forging, 26 19 We have demonstrated that a large quantity of nanoscopic defects inside the grains form at an optimized texturing temperature, decreasing the lattice thermal conductivity; meanwhile, a textured structure greatly enhances the electrical transport properties.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric performance enhancement in n-type Bi2(TeSe)3 alloys owing to nanoscale inhomogeneity combined with a spark plasma-textured microstructure

Pan

2016

NPG Asia Mater

169

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Bi 2 Te 3 is a good thermoelectric compound that can be adjusted to p-or n-type with corresponding substitutions; however, less progress has been achieved for the property enhancement of n-type Bi 2 (TeSe) 3 compared with p-type (BiSb) 2 Te 3 . Textured n-type Bi 2 (TeSe) 3 with an enhanced thermoelectric performance has been developed in this study by combining texturing with in situ nanostructuring effects. The spark plasma-textured structure boosts the electrical transport properties and the power factors as benefits of the layered microstructure. It also leads to a simultaneous rise in the thermal conductivity along the a-axis. We developed a method to suppress increases in the thermal conductivity by inducing nanostructures, such as highly distorted regions and nanoscopic defect clusters, as well as dislocation loops that can form when texturing occurs at an optimized temperature. In this work, textured n-type Bi 2 (TeSe) 3 materials having enhanced thermoelectric performances within a low temperature range are developed with a maximum dimensionless figure of merit (ZT max ) exceeding 1.1 at 473 K. The present method, which synergetically utilizes the texturing and nanostructuring effects, could also be applied to other thermoelectric compounds having layered structures.

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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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Enhanced thermoelectric and mechanical properties in textured n-type Bi2Te3 prepared by spark plasma sintering

Cited by 245 publications

References 36 publications

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

Thermoelectric performance enhancement in n-type Bi2(TeSe)3 alloys owing to nanoscale inhomogeneity combined with a spark plasma-textured microstructure

Promising Thermoelectric Bulk Materials with 2D Structures

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