Effects of Cooling Rate on Thermoelectric Properties of n-Type Bi2(Se0.4Te0.6)3 Compounds

Wang, S. Y.; Xie, Wenjie; Li, H.; Tang, Xinfeng; Zhang, Q. J.

doi:10.1007/s11664-011-1559-3

Cited by 17 publications

(8 citation statements)

References 25 publications

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“…[69][70][71]146] As ar esult, ar emarkably high zT of % 1.56 at 300 Kw as observed in p-type Bi 2Àx Sb x Te 3 nanograined alloys (Table 1). Recently,M Sw as used as one of the key processing technologiest of abricate nanograined TE alloys.…”

Section: Bottom-up Methodsmentioning

confidence: 58%

“…This technique was proposed to prepare Bi 2 Te 3 -based ribbonsw ith ah igh density of nanograins. [69][70][71]146] As ar esult, ar emarkably high zT of % 1.56 at 300 Kw as observed in p-type Bi 2Àx Sb x Te 3 nanograined alloys (Table 1). It was reported that the formationof10-20 nm nanograins on the contact surface (ribbon and Cu wheel)o ft he melt-spun ribbon plays ac ritical role in the significant reduction of k lat .Aphotograph and the microstructure of our meltspun Bi 0.5 Sb 1.5 Te 3 ribbon are shown in Figure17.…”

Section: Top-down Methodsmentioning

confidence: 58%

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Boundary Engineering for the Thermoelectric Performance of Bulk Alloys Based on Bismuth Telluride

et al. 2015

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Thermoelectrics, which transports heat for refrigeration or converts heat into electricity directly, is a key technology for renewable energy harvesting and solid-state refrigeration. Despite its importance, the widespread use of thermoelectric devices is constrained because of the low efficiency of thermoelectric bulk alloys. However, boundary engineering has been demonstrated as one of the most effective ways to enhance the thermoelectric performance of conventional thermoelectric materials such as Bi2 Te3 , PbTe, and SiGe alloys because their thermal and electronic transport properties can be manipulated separately by this approach. We review our recent progress on the enhancement of the thermoelectric figure of merit through boundary engineering together with the processing technologies for boundary engineering developed most recently using Bi2 Te3 -based bulk alloys. A brief discussion of the principles and current status of boundary-engineered bulk alloys for the enhancement of the thermoelectric figure of merit is presented. We focus mainly on (1) the reduction of the thermal conductivity by grain boundary engineering and (2) the reduction of thermal conductivity without deterioration of the electrical conductivity by phase boundary engineering. We also discuss the next potential approach using two boundary engineering strategies for a breakthrough in the area of bulk thermoelectric alloys.

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Section: Bottom-up Methodsmentioning

confidence: 58%

Section: Top-down Methodsmentioning

confidence: 58%

Boundary Engineering for the Thermoelectric Performance of Bulk Alloys Based on Bismuth Telluride

et al. 2015

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“…In view of the successful implementation of the MS-SPS and BM-HP techniques in the p-type Bi 2 Te 3 (SE-MS-SPSed p-type (Bi,Sb) 2 Te 3 nanocomposites, section), it is instructive to implement the same nanostructuirng procedure in the n-type Bi 2 Te 3 . Interestingly, the ZT improvement of the n-type material turned out to be small [59,60,70,71,80,81]. We will discuss this discrepancy and possible solution in the section ''Why the MS-SPS procedure is less effective in n-type Bi 2 (SeTe) 3 nanocomposites''.…”

Section: Se-ms-spsed N-type Bi 2 (Sete) 3 Nanocompositementioning

confidence: 99%

High performance Bi2Te3 nanocomposites prepared by single-element-melt-spinning spark-plasma sintering

et al. 2012

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The last decade has witnessed nanocomposites becoming a new paradigm in the field of thermoelectric (TE) research. At its core is to prepare high performance TE nanocomposites, both p-and n-type, in a time and energy efficient way. To this end, we in this article summarize our recent effort and results on both p-and n-type Bi 2 Te 3 -based nanocomposites prepared by a unique single-element-meltspinning spark-plasma sintering procedure. The results of transport measurements, scanning and transmission electronic microscopy, and small angle neutron scattering have proved essential in order to establish the correlation between the nanostructures and the TE performance of the materials. Interestingly, we find that in situ formed nanocrystals with coherent boundaries are the key nanostructures responsible for the significantly improved TE performance of p-type Bi 2 Te 3 nanocomposites whereas similar nanostructures turn out to be less effective for n-type Bi 2 Te 3 nanocomposites. We also discuss the alternative strategies to further improve the TE performance of n-type Bi 2 Te 3 materials via nanostructuring processes.

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“…A molten alloy thin stream is poured on a spinning wheel. [97][98][99] The melting heat is quickly transferred to the wheel followed by rotation, which sustains the amorphization of liquid continuously, producing thin tapes and ribbons. 100 The local cooling and cooling rate regulate the microstructure of the materials in the synthesis process and are maintained through processing parameters in melt spinning.…”

Section: Melt Spinning (Ms)mentioning

confidence: 99%

A Review on Doped/Composite Bismuth Chalcogenide Compounds for Thermoelectric Device Applications: Various Synthesis Techniques and Challenges

Hegde

Prabhu

2022

J. Electron. Mater.

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One of the global demands of primary research objectives is to achieve human energy harvesting and self-powered wearable technologies. Bismuth chalcogenides are the trending materials for thermoelectric generators and Peltier coolers due to their notable thermoelectric figure of merit in the low- and room-temperature range. Systematic alloying of bismuth chalcogenides leads to a substantial change in their electrical and thermal transport properties. The high thermoelectric figure of merit (ZT) observed in bismuth chalcogenides is due to the rhombohedral crystal structure, lower effective mass, low thermal conductivity, and large band degeneracy. This review is aimed at identifying and quantifying different techniques for effectively improving the thermoelectric properties of doped/composite bismuth chalcogenide compounds. The review also examines the various synthesis methods including ball milling (BM), spark plasma sintering (SPS), self-propagating high-temperature synthesis (SHS), soft chemical reaction, hydrothermal reaction, melt growth (MG), melt spinning (MS), sintering and consolidated synthesis, and hot extrusion, with their respective figures of merit. Since device modification is a challenging task, this report reviews the present research on bismuth chalcogenide alloys to benchmark future development using various techniques. Graphical Abstract

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Effects of Cooling Rate on Thermoelectric Properties of n-Type Bi2(Se0.4Te0.6)3 Compounds

Cited by 17 publications

References 25 publications

Boundary Engineering for the Thermoelectric Performance of Bulk Alloys Based on Bismuth Telluride

Boundary Engineering for the Thermoelectric Performance of Bulk Alloys Based on Bismuth Telluride

High performance Bi2Te3 nanocomposites prepared by single-element-melt-spinning spark-plasma sintering

A Review on Doped/Composite Bismuth Chalcogenide Compounds for Thermoelectric Device Applications: Various Synthesis Techniques and Challenges

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