Inorganics 2014, 2(2), 351-362; doi:10.3390/inorganics2020351

Thermoelectric Properties of Mg2Si Produced by New Chemical Route and SPS

1,†,* email, 2,†, 2,†, 2, 2, 2, 3 and 3
Received: 15 January 2014; in revised form: 9 May 2014 / Accepted: 27 May 2014 / Published: 20 June 2014
(This article belongs to the Special Issue Energy Storage and Conversion)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: This paper reports about a new synthesis method for preparing Mg2Si in an efficient way. The intermetallic Mg2Si-phase forms gradually from a mixture of Mg and Si fine powder during exposure to hydrogen atmosphere, which reacts in a vacuum vessel at 350 °C. The resulting powder has the same particle size (100 µm) compared with commercial Mg2Si powder, but higher reactivity due to large surface area from particulate morphology. Both types of powders were compacted by spark plasma sintering (SPS) experiments at 627, 602, 597, and 400 °C for 600 s with a compaction pressure of 80 MPa. The thermoelectric characterization was performed with low and high temperature gradients of ΔT = 10 K up to 600 K. The results confirmed a Seebeck coefficient of −0.14 mV/K for specimens sintered from both powders. The small difference in total performance between purchased and produced power is considered to be due to the effect of impurities. The best values were obtained for n-type Mg2Si doped with 3% Bi yielding a Seebeck coefficient of −0.2 mV/K, ZT = 0.45) and electric output power of more than 6 µW.
Keywords: thermoelectrics; silicide; hydrogen sorption; microstructure; power generation; Seebeck coefficient
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MDPI and ACS Style

Wunderlich, W.; Suzuki, Y.; Gibo, N.; Ohkuma, T.; Al-Abandi, M.; Sato, M.; Khan, A.U.; Mori, T. Thermoelectric Properties of Mg2Si Produced by New Chemical Route and SPS. Inorganics 2014, 2, 351-362.

AMA Style

Wunderlich W, Suzuki Y, Gibo N, Ohkuma T, Al-Abandi M, Sato M, Khan AU, Mori T. Thermoelectric Properties of Mg2Si Produced by New Chemical Route and SPS. Inorganics. 2014; 2(2):351-362.

Chicago/Turabian Style

Wunderlich, Wilfried; Suzuki, Yoshihito; Gibo, Naoto; Ohkuma, Takahiro; Al-Abandi, Muayyad; Sato, Masashi; Khan, Atta U.; Mori, Takao. 2014. "Thermoelectric Properties of Mg2Si Produced by New Chemical Route and SPS." Inorganics 2, no. 2: 351-362.

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