Preparation and thermoelectric properties of Mg2Si fabricated by one-step synthesis method

Yang Li; Shao Ping Chen; Yuan Yuan Jiao; Bo Zeng; Qing Sen Meng; Tang Hong Yi; S. M. Kauzlarich; D. V. Quanch; Z. A. Munir

doi:10.3969/j.issn.1001-9731.2014.16.023

Preparation and thermoelectric properties of Mg₂Si fabricated by one-step synthesis method

Yang Li, Shao Ping Chen, Yuan Yuan Jiao, Bo Zeng, Qing Sen Meng, Tang Hong Yi, S. M. Kauzlarich, D. V. Quanch, Z. A. Munir

Chemistry

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

Abstract

High-purity magnesium hydride(MgH₂), silicon(Si) and bismuth(Bi) powders were selected as the raw materials to prepare Bi (1mol%)-doped Mg₂Si thermoelectric materials by field-activated and pressure-assisted synthesis(FAPAS) in one step. The synthesis process, phase component and thermoelectric properties were studied, and the results was also compared with that prepared from tube furnace process followed by FAPAS (T+F).The results shows that it's feasible to prepare Mg₂Si pellet with high purity, nano-structure and also lower thermal conductivity in short time in one-step method, which improves the figure of merit greatly. Meanwhile, a little bit extra silicon particle was helpful to improve the thermoelectric performance of materials, so the sample with a ratio of 1.95∶1 has higher ZT value than that of 2∶1. At 725 K, ZT value of the former reaches 0.54.

Original language	English (US)
Journal	Gongneng Cailiao/Journal of Functional Materials
Volume	45
Issue number	16
DOIs	https://doi.org/10.3969/j.issn.1001-9731.2014.16.023
State	Published - Aug 30 2014

Keywords

FAPAS
MgSi
MgH
One-step synthesis
Thermoelectric material

ASJC Scopus subject areas

Electrical and Electronic Engineering
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
Materials Chemistry

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Preparation and thermoelectric properties of Mg₂Si fabricated by one-step synthesis method. / Li, Yang; Chen, Shao Ping; Jiao, Yuan Yuan; Zeng, Bo; Meng, Qing Sen; Yi, Tang Hong; Kauzlarich, S. M.; Quanch, D. V.; Munir, Z. A.

In: Gongneng Cailiao/Journal of Functional Materials, Vol. 45, No. 16, 30.08.2014.

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

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title = "Preparation and thermoelectric properties of Mg2Si fabricated by one-step synthesis method",

abstract = "High-purity magnesium hydride(MgH2), silicon(Si) and bismuth(Bi) powders were selected as the raw materials to prepare Bi (1mol%)-doped Mg2Si thermoelectric materials by field-activated and pressure-assisted synthesis(FAPAS) in one step. The synthesis process, phase component and thermoelectric properties were studied, and the results was also compared with that prepared from tube furnace process followed by FAPAS (T+F).The results shows that it's feasible to prepare Mg2Si pellet with high purity, nano-structure and also lower thermal conductivity in short time in one-step method, which improves the figure of merit greatly. Meanwhile, a little bit extra silicon particle was helpful to improve the thermoelectric performance of materials, so the sample with a ratio of 1.95∶1 has higher ZT value than that of 2∶1. At 725 K, ZT value of the former reaches 0.54.",

keywords = "FAPAS, MgSi, MgH, One-step synthesis, Thermoelectric material",

author = "Yang Li and Chen, {Shao Ping} and Jiao, {Yuan Yuan} and Bo Zeng and Meng, {Qing Sen} and Yi, {Tang Hong} and Kauzlarich, {S. M.} and Quanch, {D. V.} and Munir, {Z. A.}",

year = "2014",

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journal = "Gongneng Cailiao/Journal of Functional Materials",

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AU - Li, Yang

AU - Chen, Shao Ping

AU - Jiao, Yuan Yuan

AU - Zeng, Bo

AU - Meng, Qing Sen

AU - Yi, Tang Hong

AU - Kauzlarich, S. M.

AU - Quanch, D. V.

AU - Munir, Z. A.

PY - 2014/8/30

Y1 - 2014/8/30

N2 - High-purity magnesium hydride(MgH2), silicon(Si) and bismuth(Bi) powders were selected as the raw materials to prepare Bi (1mol%)-doped Mg2Si thermoelectric materials by field-activated and pressure-assisted synthesis(FAPAS) in one step. The synthesis process, phase component and thermoelectric properties were studied, and the results was also compared with that prepared from tube furnace process followed by FAPAS (T+F).The results shows that it's feasible to prepare Mg2Si pellet with high purity, nano-structure and also lower thermal conductivity in short time in one-step method, which improves the figure of merit greatly. Meanwhile, a little bit extra silicon particle was helpful to improve the thermoelectric performance of materials, so the sample with a ratio of 1.95∶1 has higher ZT value than that of 2∶1. At 725 K, ZT value of the former reaches 0.54.

AB - High-purity magnesium hydride(MgH2), silicon(Si) and bismuth(Bi) powders were selected as the raw materials to prepare Bi (1mol%)-doped Mg2Si thermoelectric materials by field-activated and pressure-assisted synthesis(FAPAS) in one step. The synthesis process, phase component and thermoelectric properties were studied, and the results was also compared with that prepared from tube furnace process followed by FAPAS (T+F).The results shows that it's feasible to prepare Mg2Si pellet with high purity, nano-structure and also lower thermal conductivity in short time in one-step method, which improves the figure of merit greatly. Meanwhile, a little bit extra silicon particle was helpful to improve the thermoelectric performance of materials, so the sample with a ratio of 1.95∶1 has higher ZT value than that of 2∶1. At 725 K, ZT value of the former reaches 0.54.

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KW - MgSi

KW - MgH

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