Fabrication of large sintered pellets of Sb-doped n-type Mg2Si using a plasma activated sintering method

Sb is known to be the most stable n-type dopant in Mg2Si, whereas the reproducibility and sintering scalability of Sb-doped Mg2Si has proved to be difficult. We have developed a metallic binder for the Sb-doped Mg2Si sintering process. A remarkable benefit of the binder is that it enables us to repr...

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Bibliographic Details
Published in:Journal of solid state chemistry 2012-09, Vol.193, p.161-165
Main Authors: Hayatsu, Yusuke, Iida, Tsutomu, Sakamoto, Tatsuya, Kurosaki, Shota, Nishio, Keishi, Kogo, Yasuo, Takanashi, Yoshifumi
Format: Article
Language:English
Subjects:
Antimony
Binder
Binders
Intermetallics
Magnesium compounds
Mg2Si
Nickel
Semiconductors
Silicides
Sintering
Thermoelectrics
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Summary:Sb is known to be the most stable n-type dopant in Mg2Si, whereas the reproducibility and sintering scalability of Sb-doped Mg2Si has proved to be difficult. We have developed a metallic binder for the Sb-doped Mg2Si sintering process. A remarkable benefit of the binder is that it enables us to reproducibly fabricate large sintered Sb-doped Mg2Si pellets up to 30mm in diameter with no internal cracks. For binder contents of 3–7wt%, the observed power factor and thermal conductivity were identical to that of conventional Sb-doped samples, while excess binder degraded the TE properties. The binder mixture also plays a part in increasing the yield in the production of TE legs, up to 82% for 5wt% Ni incorporation, as well as improving the hardness of the sintered sample. Incorporation of 5wt% Ni binder affected an increase in the ZT value up to 0.97. The sample of 30mm in diameter is fabricated by using a Ni binder. [Display omitted] ► We have developed a metallic binder for the Sb-doped Mg2Si sintering process. ► Sb-doped Mg2Si pellets up to 30mm in diameter with no internal cracks. ► Incorporation of 5wt% Ni binder affected an increase in the ZT value up to 0.97.
ISSN:0022-4596
1095-726X
DOI:10.1016/j.jssc.2012.07.008