Fabrication and characterization of Mn-Si thermoelectric materials by mechanical alloying (MA법에 의한 Mn-Si계 초미세 열전재료의 제조 및 평가)

Lee Chung-Hyo (이충효)

Fabrication and characterization of Mn-Si thermoelectric materials by mechanical alloying

Journal of the Korean Crystal Growth and Crystal Technology
Abbr : J. Korean Cryst. Growth Cryst. Technol.
2011, 21(6), pp.246-252
Publisher : The Korea Association Of Crystal Growth, Inc.
Research Area : Engineering > Materials Science and Engineering

Lee Chung-Hyo ¹

¹목포대학교

Accredited

ABSTRACT

The semiconducting MnSi1.73 compound has been recognized as a thermoelectric material with excellent oxidation resistance and stable characteristics at elevated temperature. In the present work, we applied mechanical alloying (MA)technique to produce MnSi1.73 compound using a mixture of elemental manganese and silicon powders. The mechanical alloying was carried out using a Fritsch P-5 planetary mill under Ar gas atmosphere. The MA powders were characterized by the X-ray diffraction with Cu-Kα radiation, thermal analysis and scanning electron microscopy. Due to the observed larger loss of Si relative to Mn during mechanical alloying of MnSi1.73, the starting composition of a mixture Mn-Si was modified to MnSi1.83 and then MnSi1.88. The single MnSi1.73 phase has been obtained by mechanical alloying of MnSi1.88mixture powders for 200 hours. It is also found that the grain size of MnSi1.73 compound powders analyzed by Hall plot method is reduced to 40 nm after 200 hours of milling.

KEYWORDS

Mechanical alloying, Thermoelectric material, MnSi1.73 compound, Grain size, Hall plot

Citation status

* References for papers published after 2023 are currently being built.

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This paper was written with support from the National Research Foundation of Korea.

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Journal of the Korean Crystal Growth and Crystal Technology 2023 KCI Impact Factor : 0.19