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Thermoelectric characteristics of the spark plasma-sintered silicon boride ceramics  

Shim, Seung-Hwan (Department of Ceramic Engineering, CPRC, Hanyang University)
Lee, Dae-Woong (Department of Ceramic Engineering, CPRC, Hanyang University)
Chae, Jae-Hong (Research Planning Team, KICET)
Matsushita, Jun-Ichi (Department of Materials Science, Tokai University)
Shim, Kwang-Bo (Department of Ceramic Engineering, CPRC, Hanyang University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.15, no.2, 2005 , pp. 75-78 More about this Journal
Abstract
Silicon boride ($SiB_6$) is very promising for use as thermoelectric materials at high temperature because of its high melting point and relatively large Seebeck coefficient. In the present work, spark plasma sintering (SPS) was applied for preparing dense $SiB_6$ ceramics, and their thermoelectric properties were investigated, together with their microstructural evaluation. The SPS process was found to be effective in densifying a $SiB_6$ ceramic, typically 99 % of the theoretical density at low temperature of $1500^{\circ}C$. In comparison with $SiB_6$ specimen prepared by hot-pressing, the SPS-processed specimen exhibited the significantly improved Seebeck coefficient, resulting in the higher power factor.
Keywords
Silicon boride; Spark plasma sintering; Thermoelectric properties;
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