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

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• 作者：Yusuke Hayatsu ; Tsutomu Iida ; Tatsuya Sakamoto ; Shota Kurosaki ; Keishi Nishio ; Yasuo Kogo ; Yoshifumi Takanashi
• 关键词：Thermoelectrics ; Mg2Si ; Sintering ; Binder
• 刊名：Journal of Solid State Chemistry
• 出版年：2012
• 出版时间：September, 2012
• 年：2012
• 卷：193
• 期：Complete
• 页码：161-165
• 全文大小：1098 K

文摘

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 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.