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Thermoelectric properties and spark plasma sintering of doped YB22C2N

Published online by Cambridge University Press:  31 January 2011

David Berthebaud ,
Toshiyuki Nishimura  and
Takao Mori
Takao Mori*
Affiliation:
National Institute for Materials Science, Namiki 1-1, Tsukuba, 305-0044 Japan
*
a)Address all correspondence to this author. e-mail: MORI.Takao@nims.go.jp
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Abstract

YB22C2N is one of a series of rare earth borocarbonitrides and is potentially the long awaited n-type counterpart to boron carbide. We conducted studies on YB22C2N spark plasma sintered with additions of YB4 and YB25C, including the investigations of the densification process and the thermoelectric properties of the material. We discovered that a small amount of dopants can lower the starting temperature of densification during spark plasma sintering (SPS). Variations of pressure and temperature during the sintering process are also found to have an effect. Electrical conductivity of the dense samples has increased due to insertion of metal borides and also because of the improvement of the relative density. At the same time, only a slight reduction was observed for the Seebeck coefficient leading to an important improvement of power factor. The highest density of more than 95% was achieved with 5 wt% of YB25(C) dopant.

Keywords

DensificationAdditivesB
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 4 , April 2010 , pp. 665 - 669
Copyright
Copyright © Materials Research Society 2010

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References

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