Suppressed secondary phase generation in thermoelectric higher manganese silicide by fabrication process optimization

Gwansik Kim; Hyun Jun Rim; Kyu Hyoung Lee; Jong Wook Roh; Wooyoung Lee

doi:10.1016/j.ceramint.2019.06.104

Suppressed secondary phase generation in thermoelectric higher manganese silicide by fabrication process optimization

Gwansik Kim, Hyun Jun Rim, Kyu Hyoung Lee, Jong Wook Roh, Wooyoung Lee

Department of Materials Science and Engineering

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

7 Citations (Scopus)

Abstract

Controlling the generation of secondary phases in thermoelectric higher manganese silicides is crucial to enhance their thermoelectric performance for use in automotive thermoelectric generators. However, the effect of different synthesis and sintering procedures on the secondary phase formation and thermoelectric properties has not yet been investigated. In this study, we demonstrate that fabricating Mn₁₁Si₁₉ via arc melting and spark plasma sintering results in a figure of merit (ZT) of 0.43 at 823 K, which is 15% higher than for a sample fabricated by a solid-state reaction and spark plasma sintering. We found that the presence of secondary MnSi phases in the Mn₁₁Si₁₉ samples was significantly reduced when using arc melting instead of solid-state reaction, which suggests that the phase formation behavior could be controlled by optimizing the fabrication process.

Original language	English
Pages (from-to)	19538-19541
Number of pages	4
Journal	Ceramics International
Volume	45
Issue number	15
DOIs	https://doi.org/10.1016/j.ceramint.2019.06.104
Publication status	Published - 2019 Oct 15

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) Grant ( 2017R1A2A1A17069528 ) and Priority Research Centers Program ( 2019R1A6A1A11055660 ).

Publisher Copyright:
© 2019 Elsevier Ltd and Techna Group S.r.l.

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/j.ceramint.2019.06.104

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title = "Suppressed secondary phase generation in thermoelectric higher manganese silicide by fabrication process optimization",

abstract = "Controlling the generation of secondary phases in thermoelectric higher manganese silicides is crucial to enhance their thermoelectric performance for use in automotive thermoelectric generators. However, the effect of different synthesis and sintering procedures on the secondary phase formation and thermoelectric properties has not yet been investigated. In this study, we demonstrate that fabricating Mn11Si19 via arc melting and spark plasma sintering results in a figure of merit (ZT) of 0.43 at 823 K, which is 15% higher than for a sample fabricated by a solid-state reaction and spark plasma sintering. We found that the presence of secondary MnSi phases in the Mn11Si19 samples was significantly reduced when using arc melting instead of solid-state reaction, which suggests that the phase formation behavior could be controlled by optimizing the fabrication process.",

author = "Gwansik Kim and Rim, {Hyun Jun} and Lee, {Kyu Hyoung} and Roh, {Jong Wook} and Wooyoung Lee",

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AU - Kim, Gwansik

AU - Rim, Hyun Jun

AU - Lee, Kyu Hyoung

AU - Roh, Jong Wook

AU - Lee, Wooyoung

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (NRF) Grant ( 2017R1A2A1A17069528 ) and Priority Research Centers Program ( 2019R1A6A1A11055660 ). Publisher Copyright: © 2019 Elsevier Ltd and Techna Group S.r.l.

PY - 2019/10/15

Y1 - 2019/10/15

N2 - Controlling the generation of secondary phases in thermoelectric higher manganese silicides is crucial to enhance their thermoelectric performance for use in automotive thermoelectric generators. However, the effect of different synthesis and sintering procedures on the secondary phase formation and thermoelectric properties has not yet been investigated. In this study, we demonstrate that fabricating Mn11Si19 via arc melting and spark plasma sintering results in a figure of merit (ZT) of 0.43 at 823 K, which is 15% higher than for a sample fabricated by a solid-state reaction and spark plasma sintering. We found that the presence of secondary MnSi phases in the Mn11Si19 samples was significantly reduced when using arc melting instead of solid-state reaction, which suggests that the phase formation behavior could be controlled by optimizing the fabrication process.

AB - Controlling the generation of secondary phases in thermoelectric higher manganese silicides is crucial to enhance their thermoelectric performance for use in automotive thermoelectric generators. However, the effect of different synthesis and sintering procedures on the secondary phase formation and thermoelectric properties has not yet been investigated. In this study, we demonstrate that fabricating Mn11Si19 via arc melting and spark plasma sintering results in a figure of merit (ZT) of 0.43 at 823 K, which is 15% higher than for a sample fabricated by a solid-state reaction and spark plasma sintering. We found that the presence of secondary MnSi phases in the Mn11Si19 samples was significantly reduced when using arc melting instead of solid-state reaction, which suggests that the phase formation behavior could be controlled by optimizing the fabrication process.

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JO - Ceramics International

JF - Ceramics International

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Suppressed secondary phase generation in thermoelectric higher manganese silicide by fabrication process optimization

Abstract

Bibliographical note

All Science Journal Classification (ASJC) codes

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