Effect of Si content on the thermoelectric transport properties of Ge-doped higher manganese silicides

Hwijong Lee; Gwansik Kim; Byunghun Lee; Jeongmin Kim; Soon Mok Choi; Kyu Hyoung Lee; Wooyoung Lee

doi:10.1016/j.scriptamat.2017.03.011

Effect of Si content on the thermoelectric transport properties of Ge-doped higher manganese silicides

Hwijong Lee, Gwansik Kim, Byunghun Lee, Jeongmin Kim, Soon Mok Choi, Kyu Hyoung Lee, Wooyoung Lee

Department of Materials Science and Engineering

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

26 Citations (Scopus)

Abstract

Polycrystalline bulks of Si-content tuned Ge-doped higher manganese silicides (HMSs) were fabricated to elucidate the effects of Si content on the phase formation behavior and thermoelectric properties. The phase formation and electronic transport characteristics of HMSs were significantly dependent on Si content. Improved power factor was obtained at higher Si contents because of an enhanced Seebeck coefficient due to the increase in density of states effective mass, maintaining electrical conductivity. Furthermore, the lattice thermal conductivity was reduced through Si-content tuning, which suppressed the formation of secondary phases. Thus, a maximum ZT of 0.61 at 823 K was obtained in MnSi_1.77Ge_0.027.

Original language	English
Pages (from-to)	72-75
Number of pages	4
Journal	Scripta Materialia
Volume	135
DOIs	https://doi.org/10.1016/j.scriptamat.2017.03.011
Publication status	Published - 2017 Jul 1

Bibliographical note

Publisher Copyright:
© 2017 Acta Materialia Inc.

All Science Journal Classification (ASJC) codes

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

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10.1016/j.scriptamat.2017.03.011

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title = "Effect of Si content on the thermoelectric transport properties of Ge-doped higher manganese silicides",

abstract = "Polycrystalline bulks of Si-content tuned Ge-doped higher manganese silicides (HMSs) were fabricated to elucidate the effects of Si content on the phase formation behavior and thermoelectric properties. The phase formation and electronic transport characteristics of HMSs were significantly dependent on Si content. Improved power factor was obtained at higher Si contents because of an enhanced Seebeck coefficient due to the increase in density of states effective mass, maintaining electrical conductivity. Furthermore, the lattice thermal conductivity was reduced through Si-content tuning, which suppressed the formation of secondary phases. Thus, a maximum ZT of 0.61 at 823 K was obtained in MnSi1.77Ge0.027.",

author = "Hwijong Lee and Gwansik Kim and Byunghun Lee and Jeongmin Kim and Choi, {Soon Mok} and Lee, {Kyu Hyoung} and Wooyoung Lee",

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T1 - Effect of Si content on the thermoelectric transport properties of Ge-doped higher manganese silicides

AU - Lee, Hwijong

AU - Kim, Gwansik

AU - Lee, Byunghun

AU - Kim, Jeongmin

AU - Choi, Soon Mok

AU - Lee, Kyu Hyoung

AU - Lee, Wooyoung

PY - 2017/7/1

Y1 - 2017/7/1

N2 - Polycrystalline bulks of Si-content tuned Ge-doped higher manganese silicides (HMSs) were fabricated to elucidate the effects of Si content on the phase formation behavior and thermoelectric properties. The phase formation and electronic transport characteristics of HMSs were significantly dependent on Si content. Improved power factor was obtained at higher Si contents because of an enhanced Seebeck coefficient due to the increase in density of states effective mass, maintaining electrical conductivity. Furthermore, the lattice thermal conductivity was reduced through Si-content tuning, which suppressed the formation of secondary phases. Thus, a maximum ZT of 0.61 at 823 K was obtained in MnSi1.77Ge0.027.

AB - Polycrystalline bulks of Si-content tuned Ge-doped higher manganese silicides (HMSs) were fabricated to elucidate the effects of Si content on the phase formation behavior and thermoelectric properties. The phase formation and electronic transport characteristics of HMSs were significantly dependent on Si content. Improved power factor was obtained at higher Si contents because of an enhanced Seebeck coefficient due to the increase in density of states effective mass, maintaining electrical conductivity. Furthermore, the lattice thermal conductivity was reduced through Si-content tuning, which suppressed the formation of secondary phases. Thus, a maximum ZT of 0.61 at 823 K was obtained in MnSi1.77Ge0.027.

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Effect of Si content on the thermoelectric transport properties of Ge-doped higher manganese silicides

Abstract

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