Thermoelectric and thermomechanical properties of the hot pressed polycrystalline Bi0.5Sb1.5Te3 alloys

Shen, Jiajun; Zhang, S.N.; Yang, Shenghui; Yin, Zhaozheng; Zhu, Tiejun; Zhao, Xinbing

doi:10.1016/j.jallcom.2010.09.014

Cited by 21 publications

(8 citation statements)

References 28 publications

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“…After annealing at 573 K for one week, the excess Te remained, but certain amount of microcracks initiated and extended along the interface between the lamellar structures of Bi 0.5 Sb 1.5 Te 3 and Te strips. This can be explained by the mismatch of the coefficient of thermal expansion (CTE) between the matrix and precipitates [ 47 , 48 ], which resulted in the accumulation of localized thermal stresses and gradually generated microcracks [ 49 ]. The compositions from the EDS results ( Table S2 ) confirm the phase homogeneity of ZM samples annealed at 573 K. On the other hand, it has been reported that MS-PAS is a non-equilibrium process which can generate in-situ nanostructures at the grain boundaries [ 21 ].…”

Section: Resultsmentioning

confidence: 99%

Thermal Stability of P-Type BiSbTe Alloys Prepared by Melt Spinning and Rapid Sintering

et al. 2017

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P-type BiSbTe alloys have been widely implemented in waste heat recovery from low-grade heat sources below 600 K, which may involve assorted environments and conditions, such as long-term service, high-temperature exposure (generally 473–573 K) and mechanical forces. It is important to evaluate the service performance of these materials in order to prevent possible failures in advance and extend the life cycle. In this study, p-type Bi0.5Sb1.5Te3 commercial zone-melting (ZM) ingots were processed by melt spinning and subsequent plasma-activated sintering (MS-PAS), and were then subjected to vacuum-annealing at 473 and 573 K, respectively, for one week. The results show that MS-PAS samples exhibit excellent thermal stability when annealed at 473 K. However, thermal annealing at 573 K for MS-PAS specimens leads to the distinct sublimation of the element Te, which degrades the hole concentration remarkably and results in inferior thermoelectric performance. Furthermore, MS-PAS samples annealed at 473 K demonstrate a slight enhancement in flexural and compressive strengths, probably due to the reduction of residual stress induced during the sintering process. The current work guides the reliable application of p-type Bi0.5Sb1.5Te3 compounds prepared by the MS-PAS technique.

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Section: Resultsmentioning

confidence: 99%

Thermal Stability of P-Type BiSbTe Alloys Prepared by Melt Spinning and Rapid Sintering

et al. 2017

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“…Traditionally, Bi 2 Te 3 -based alloys are fabricated by one-directional crystal growth methods such as Bridgman, Czochralsky and zone-melting techniques [6][7][8], powder metallurgy techniques such as hot-pressing (HP) [9,10], hot extrusion [11,12], and spark plasma sintering (SPS) method [13][14][15]. Although there have been a lot of academic research conducted on p-type Bi 2 Te 3 -based alloys [16][17][18], the ZT values for n-type Bi 2 Te 3 -based alloys is about 0.85 and has not been improved for a long time due to their high thermal conductivity [19].…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermoelectric performance in n -type Bi 2 Te 2.95 Se 0.05 bulks fabricated by high pressure sintering technique

Zou

Wang

2014

Materials Research Bulletin

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“…This power factor can be optimized as a function of the carrier concentration. Therefore, k must be reduced to maximize ZT [1,2].…”

Section: Introductionmentioning

confidence: 99%

Characterizations of solid-state microwave-synthesized Sb2Te3-based alloys with various compositions of bismuth in Bi2xSb2(1−x)Te3

Kadhim

Hmood

Hassan

2012

Materials Science in Semiconductor Processing

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Thermoelectric and thermomechanical properties of the hot pressed polycrystalline Bi0.5Sb1.5Te3 alloys

Cited by 21 publications

References 28 publications

Thermal Stability of P-Type BiSbTe Alloys Prepared by Melt Spinning and Rapid Sintering

Thermal Stability of P-Type BiSbTe Alloys Prepared by Melt Spinning and Rapid Sintering

Enhanced thermoelectric performance in n -type Bi 2 Te 2.95 Se 0.05 bulks fabricated by high pressure sintering technique

Characterizations of solid-state microwave-synthesized Sb2Te3-based alloys with various compositions of bismuth in Bi2xSb2(1−x)Te3

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