Effect of Interstitial Mg in Mg2+xSi on Electrical Conductivity  and Seebeck Coefficient

M. Kubouchi; Y. Ogawa; K. Hayashi; T. Takamatsu; Y. Miyazaki

doi:10.1007/s11664-015-4126-5

Effect of Interstitial Mg in Mg_2+xSi on Electrical Conductivity and Seebeck Coefficient

M. Kubouchi, Y. Ogawa, K. Hayashi, T. Takamatsu, Y. Miyazaki

ENG - Applied Physics

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

10 Citations (Scopus)

Abstract

The crystal structure, thermoelectric properties, and microstructure of polycrystalline samples with nominal compositions Mg_2+xSi (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) have been investigated. It is revealed that the Mg_2+xSi samples were composites consisting of Mg₂Si matrix with dispersed Mg metal. The Mg₂Si crystals contained a small amount of Mg atoms at interstitial (1/2 1/2 1/2) site (Mg_i). In addition, Mg metal was present at grain boundaries between Mg₂Si crystal grains (Mg_GB). Regarding thermoelectric properties, the electrical conductivity and Seebeck coefficient of Mg_2+xSi were measured and their x dependences were discussed in terms of the amounts of Mg_i and Mg_GB. The amount of Mg_GB and the electrical conductivity indicate quite similar x dependences.

Original language	English
Pages (from-to)	1589-1593
Number of pages	5
Journal	Journal of Electronic Materials
Volume	45
Issue number	3
DOIs	https://doi.org/10.1007/s11664-015-4126-5
Publication status	Published - 2016 Mar 1

Keywords

Magnesium silicide
composite structure
interstitial Mg
thermoelectric properties

ASJC Scopus subject areas

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

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title = "Effect of Interstitial Mg in Mg2+xSi on Electrical Conductivity and Seebeck Coefficient",

abstract = "The crystal structure, thermoelectric properties, and microstructure of polycrystalline samples with nominal compositions Mg2+xSi (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) have been investigated. It is revealed that the Mg2+xSi samples were composites consisting of Mg2Si matrix with dispersed Mg metal. The Mg2Si crystals contained a small amount of Mg atoms at interstitial (1/2 1/2 1/2) site (Mgi). In addition, Mg metal was present at grain boundaries between Mg2Si crystal grains (MgGB). Regarding thermoelectric properties, the electrical conductivity and Seebeck coefficient of Mg2+xSi were measured and their x dependences were discussed in terms of the amounts of Mgi and MgGB. The amount of MgGB and the electrical conductivity indicate quite similar x dependences.",

keywords = "Magnesium silicide, composite structure, interstitial Mg, thermoelectric properties",

author = "M. Kubouchi and Y. Ogawa and K. Hayashi and T. Takamatsu and Y. Miyazaki",

note = "Publisher Copyright: {\textcopyright} 2015, The Minerals, Metals & Materials Society.",

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T1 - Effect of Interstitial Mg in Mg2+xSi on Electrical Conductivity and Seebeck Coefficient

AU - Kubouchi, M.

AU - Ogawa, Y.

AU - Hayashi, K.

AU - Takamatsu, T.

AU - Miyazaki, Y.

PY - 2016/3/1

Y1 - 2016/3/1

N2 - The crystal structure, thermoelectric properties, and microstructure of polycrystalline samples with nominal compositions Mg2+xSi (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) have been investigated. It is revealed that the Mg2+xSi samples were composites consisting of Mg2Si matrix with dispersed Mg metal. The Mg2Si crystals contained a small amount of Mg atoms at interstitial (1/2 1/2 1/2) site (Mgi). In addition, Mg metal was present at grain boundaries between Mg2Si crystal grains (MgGB). Regarding thermoelectric properties, the electrical conductivity and Seebeck coefficient of Mg2+xSi were measured and their x dependences were discussed in terms of the amounts of Mgi and MgGB. The amount of MgGB and the electrical conductivity indicate quite similar x dependences.

AB - The crystal structure, thermoelectric properties, and microstructure of polycrystalline samples with nominal compositions Mg2+xSi (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) have been investigated. It is revealed that the Mg2+xSi samples were composites consisting of Mg2Si matrix with dispersed Mg metal. The Mg2Si crystals contained a small amount of Mg atoms at interstitial (1/2 1/2 1/2) site (Mgi). In addition, Mg metal was present at grain boundaries between Mg2Si crystal grains (MgGB). Regarding thermoelectric properties, the electrical conductivity and Seebeck coefficient of Mg2+xSi were measured and their x dependences were discussed in terms of the amounts of Mgi and MgGB. The amount of MgGB and the electrical conductivity indicate quite similar x dependences.

KW - Magnesium silicide

KW - composite structure

KW - interstitial Mg

KW - thermoelectric properties

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