Effect of Zn doping on improving crystal quality and thermoelectric properties of borosilicides

Takao Mori; David Berthebaud; Toshiyuki Nishimura; Akiko Nomura; Toetsu Shishido; Kazuo Nakajima

doi:10.1039/B916028K

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Dalton Transactions

Issue 4, 2010

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Effect of Zn doping on improving crystal quality and thermoelectric properties of borosilicides

Takao Mori , David Berthebaud , Toshiyuki Nishimura , Akiko Nomura , Toetsu Shishido and Kazuo Nakajima

Dalton Trans., 2010, 39, 1027-1030

DOI: 10.1039/B916028K
Received 04 Aug 2009, Accepted 25 Sep 2009
First published on the web 03 Nov 2009
This article is part of the collection: Thermoelectric materials

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Abstract
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Transition-metal (Mo, Mn, Fe, Rh, Ti, Cu, Zn) doping was carried out on the borosilicide compound REB₄₄Si₂ (RE = rare earth). REB₄₄Si₂ compounds exhibit Seebeck coefficients greater than 200 µV K⁻¹ at high temperatures and unlike most compounds, the figure of merit shows a steep increase at T > 1000 K making them promising high-temperature thermoelectric materials. Although zinc itself does not remain in the final product, zinc doping was found to improve the crystal quality, which has been a long-standing problem for the borosilicides. As a result, a significant increase of the thermoelectric power factor by more than 30% was achieved.

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Takao Mori
David Berthebaud
Toshiyuki Nishimura
Akiko Nomura
Toetsu Shishido
Kazuo Nakajima

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Dalton Transactions

Effect of Zn doping on improving crystal quality and thermoelectric properties of borosilicides

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