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

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

doi:10.1039/C3TA13952B

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

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

Research output: Contribution to journal › Article › peer-review

69 Citations (Scopus)

Abstract

Bi2Te3 based alloys play a dominant role in commercial applications in the fields of thermoelectric energy generation and solid state cooling. By combining the densification of nanostructured powders followed by a two-step hot forging process, hierarchical nanostructured p-type Bi0.5Sb1.5Te3 alloys with good preferred orientation were successfully fabricated. The Seebeck coefficient in the direction perpendicular to the pressing force, which is highly anisotropic, is much greater than that of the material sintered via one-step sintering. Meanwhile, the nanostructure and crystal defects produced during hot forging also contribute to both higher Seebeck coefficient, and lower thermal conductivity due to more effective and preferential scattering of phonons than electrons. As a result, a 50 enhancement of ZT value (from 1 to above 1.5) in the orientated, hierarchical, nanostructured alloys was obtained.

Original language	English
Pages (from-to)	5785-5790
Journal	Journal of Material Chemistry A
Volume	2
Issue number	16
Early online date	4 Mar 2014
DOIs	https://doi.org/10.1039/C3TA13952B
Publication status	Published - 28 Apr 2014
Externally published	Yes

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

abstract = "Bi2Te3 based alloys play a dominant role in commercial applications in the fields of thermoelectric energy generation and solid state cooling. By combining the densification of nanostructured powders followed by a two-step hot forging process, hierarchical nanostructured p-type Bi0.5Sb1.5Te3 alloys with good preferred orientation were successfully fabricated. The Seebeck coefficient in the direction perpendicular to the pressing force, which is highly anisotropic, is much greater than that of the material sintered via one-step sintering. Meanwhile, the nanostructure and crystal defects produced during hot forging also contribute to both higher Seebeck coefficient, and lower thermal conductivity due to more effective and preferential scattering of phonons than electrons. As a result, a 50 enhancement of ZT value (from 1 to above 1.5) in the orientated, hierarchical, nanostructured alloys was obtained.",

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doi = "10.1039/C3TA13952B",

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T1 - Large ZT enhancement in hot forged nanostructured p-type Bi0.5Sb1.5Te3 bulk alloys

AU - Jiang, Qinghui

AU - Yan, Haixue

AU - Khaliq, Jibran

AU - Ning, Huanpo

AU - Grasso, Salvatore

AU - Simpson, Kevin

AU - Reece, Michael

PY - 2014/4/28

Y1 - 2014/4/28

N2 - Bi2Te3 based alloys play a dominant role in commercial applications in the fields of thermoelectric energy generation and solid state cooling. By combining the densification of nanostructured powders followed by a two-step hot forging process, hierarchical nanostructured p-type Bi0.5Sb1.5Te3 alloys with good preferred orientation were successfully fabricated. The Seebeck coefficient in the direction perpendicular to the pressing force, which is highly anisotropic, is much greater than that of the material sintered via one-step sintering. Meanwhile, the nanostructure and crystal defects produced during hot forging also contribute to both higher Seebeck coefficient, and lower thermal conductivity due to more effective and preferential scattering of phonons than electrons. As a result, a 50 enhancement of ZT value (from 1 to above 1.5) in the orientated, hierarchical, nanostructured alloys was obtained.

AB - Bi2Te3 based alloys play a dominant role in commercial applications in the fields of thermoelectric energy generation and solid state cooling. By combining the densification of nanostructured powders followed by a two-step hot forging process, hierarchical nanostructured p-type Bi0.5Sb1.5Te3 alloys with good preferred orientation were successfully fabricated. The Seebeck coefficient in the direction perpendicular to the pressing force, which is highly anisotropic, is much greater than that of the material sintered via one-step sintering. Meanwhile, the nanostructure and crystal defects produced during hot forging also contribute to both higher Seebeck coefficient, and lower thermal conductivity due to more effective and preferential scattering of phonons than electrons. As a result, a 50 enhancement of ZT value (from 1 to above 1.5) in the orientated, hierarchical, nanostructured alloys was obtained.

U2 - 10.1039/C3TA13952B

DO - 10.1039/C3TA13952B

M3 - Article

SN - 2050-7488

SN - 2050-7496

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EP - 5790

JO - Journal of Material Chemistry A

JF - Journal of Material Chemistry A

IS - 16

ER -

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

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