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

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)19538-19541
Number of pages4
JournalCeramics International
Volume45
Issue number15
DOIs
Publication statusPublished - 2019 Oct 15

Fingerprint

Spark plasma sintering
Solid state reactions
Manganese
Melting
Fabrication
Silicides
Sintering
manganese silicide

All Science Journal Classification (ASJC) codes

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

Cite this

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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.",
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Suppressed secondary phase generation in thermoelectric higher manganese silicide by fabrication process optimization. / Kim, Gwansik; Rim, Hyun Jun; Lee, Kyu Hyoung; Roh, Jong Wook; Lee, Wooyoung.

In: Ceramics International, Vol. 45, No. 15, 15.10.2019, p. 19538-19541.

Research output: Contribution to journalArticle

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AU - Kim, Gwansik

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AU - Lee, Wooyoung

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