Fabrication of large sintered pellets of Sb-doped n-type Mg{sub 2}Si using a plasma activated sintering method
- Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 278-8510 (Japan)
Sb is known to be the most stable n-type dopant in Mg{sub 2}Si, whereas the reproducibility and sintering scalability of Sb-doped Mg{sub 2}Si has proved to be difficult. We have developed a metallic binder for the Sb-doped Mg{sub 2}Si sintering process. A remarkable benefit of the binder is that it enables us to reproducibly fabricate large sintered Sb-doped Mg{sub 2}Si pellets up to 30 mm in diameter with no internal cracks. For binder contents of 3-7 wt%, 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 5 wt% Ni incorporation, as well as improving the hardness of the sintered sample. Incorporation of 5 wt% Ni binder affected an increase in the ZT value up to 0.97. - Graphical abstract: The sample of 30 mm in diameter is fabricated by using a Ni binder. Highlights: Black-Right-Pointing-Pointer We have developed a metallic binder for the Sb-doped Mg{sub 2}Si sintering process. Black-Right-Pointing-Pointer Sb-doped Mg{sub 2}Si pellets up to 30 mm in diameter with no internal cracks. Black-Right-Pointing-Pointer Incorporation of 5 wt% Ni binder affected an increase in the ZT value up to 0.97.
- OSTI ID:
- 22149818
- Journal Information:
- Journal of Solid State Chemistry, Vol. 193; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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