Co-doping of Al and Bi to control the transport properties for improving thermoelectric performance of Mg2Si

Gwansik Kim; Jeongmin Kim; Hwijong Lee; Sungmee Cho; Inwoong Lyo; Sujung Noh; Byung Wook Kim; Sung Wng Kim; Kyu Hyoung Lee; Wooyoung Lee

doi:10.1016/j.scriptamat.2016.01.027

Co-doping of Al and Bi to control the transport properties for improving thermoelectric performance of Mg₂Si

Gwansik Kim, Jeongmin Kim, Hwijong Lee, Sungmee Cho, Inwoong Lyo, Sujung Noh, Byung Wook Kim, Sung Wng Kim, Kyu Hyoung Lee, Wooyoung Lee

Department of Materials Science and Engineering

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

20 Citations (Scopus)

Abstract

We investigated the thermoelectric properties of Al and Bi co-doped Mg₂Si polycrystalline bulks fabricated using a solid state reaction combined with the spark plasma sintering technique. Through controlled doping of Al and Bi, the power factor could be enhanced due to an increase in the Seebeck coefficient benefiting from an enhancement of the density of states effective mass. The lattice thermal conductivity was reduced due to intensified point-defect phonon scattering originating from the mass difference between the host Si atoms and Bi dopants. By these synergetic effects, the dimensionless figure of merit (ZT) of 1.02 was obtained at 873 K.

Original language	English
Pages (from-to)	11-15
Number of pages	5
Journal	Scripta Materialia
Volume	116
DOIs	https://doi.org/10.1016/j.scriptamat.2016.01.027
Publication status	Published - 2016 Apr 15

Bibliographical note

Funding Information:
This work was supported by Hyundai Motor Company ( 2015-11-0146 ), the Korea government ( MSIP ) ( 2014R1A2A1A10053869 ), and the Priority Research Centers Program ( 2009-0093823 ) through the National Research Foundation of Korea ( NRF ), and the Industrial Fundamental Technology Development Program ( 10052977 ) funded by the Ministry of Trade, Industry and Energy ( MOTIE ) of Korea.

Publisher Copyright:
© 2016 Elsevier Ltd. All rights reserved.

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

Access to Document

10.1016/j.scriptamat.2016.01.027

Cite this

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title = "Co-doping of Al and Bi to control the transport properties for improving thermoelectric performance of Mg2Si",

abstract = "We investigated the thermoelectric properties of Al and Bi co-doped Mg2Si polycrystalline bulks fabricated using a solid state reaction combined with the spark plasma sintering technique. Through controlled doping of Al and Bi, the power factor could be enhanced due to an increase in the Seebeck coefficient benefiting from an enhancement of the density of states effective mass. The lattice thermal conductivity was reduced due to intensified point-defect phonon scattering originating from the mass difference between the host Si atoms and Bi dopants. By these synergetic effects, the dimensionless figure of merit (ZT) of 1.02 was obtained at 873 K.",

author = "Gwansik Kim and Jeongmin Kim and Hwijong Lee and Sungmee Cho and Inwoong Lyo and Sujung Noh and Kim, {Byung Wook} and Kim, {Sung Wng} and Lee, {Kyu Hyoung} and Wooyoung Lee",

note = "Funding Information: This work was supported by Hyundai Motor Company ( 2015-11-0146 ), the Korea government ( MSIP ) ( 2014R1A2A1A10053869 ), and the Priority Research Centers Program ( 2009-0093823 ) through the National Research Foundation of Korea ( NRF ), and the Industrial Fundamental Technology Development Program ( 10052977 ) funded by the Ministry of Trade, Industry and Energy ( MOTIE ) of Korea. Publisher Copyright: {\textcopyright} 2016 Elsevier Ltd. All rights reserved.",

year = "2016",

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doi = "10.1016/j.scriptamat.2016.01.027",

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T1 - Co-doping of Al and Bi to control the transport properties for improving thermoelectric performance of Mg2Si

AU - Kim, Gwansik

AU - Kim, Jeongmin

AU - Lee, Hwijong

AU - Cho, Sungmee

AU - Lyo, Inwoong

AU - Noh, Sujung

AU - Kim, Byung Wook

AU - Kim, Sung Wng

AU - Lee, Kyu Hyoung

AU - Lee, Wooyoung

N1 - Funding Information: This work was supported by Hyundai Motor Company ( 2015-11-0146 ), the Korea government ( MSIP ) ( 2014R1A2A1A10053869 ), and the Priority Research Centers Program ( 2009-0093823 ) through the National Research Foundation of Korea ( NRF ), and the Industrial Fundamental Technology Development Program ( 10052977 ) funded by the Ministry of Trade, Industry and Energy ( MOTIE ) of Korea. Publisher Copyright: © 2016 Elsevier Ltd. All rights reserved.

PY - 2016/4/15

Y1 - 2016/4/15

N2 - We investigated the thermoelectric properties of Al and Bi co-doped Mg2Si polycrystalline bulks fabricated using a solid state reaction combined with the spark plasma sintering technique. Through controlled doping of Al and Bi, the power factor could be enhanced due to an increase in the Seebeck coefficient benefiting from an enhancement of the density of states effective mass. The lattice thermal conductivity was reduced due to intensified point-defect phonon scattering originating from the mass difference between the host Si atoms and Bi dopants. By these synergetic effects, the dimensionless figure of merit (ZT) of 1.02 was obtained at 873 K.

AB - We investigated the thermoelectric properties of Al and Bi co-doped Mg2Si polycrystalline bulks fabricated using a solid state reaction combined with the spark plasma sintering technique. Through controlled doping of Al and Bi, the power factor could be enhanced due to an increase in the Seebeck coefficient benefiting from an enhancement of the density of states effective mass. The lattice thermal conductivity was reduced due to intensified point-defect phonon scattering originating from the mass difference between the host Si atoms and Bi dopants. By these synergetic effects, the dimensionless figure of merit (ZT) of 1.02 was obtained at 873 K.

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