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Thermoelectric properties of sintered polycrystalline ZnIn2S4

Published online by Cambridge University Press:  31 January 2011

Won-Seon Seo ,
Riki Otsuka ,
Harumi Okuno ,
Mitsuru Ohta  and
Kunihito Koumoto
Won-Seon Seo
Affiliation:
Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
Riki Otsuka
Affiliation:
Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
Harumi Okuno
Affiliation:
Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
Mitsuru Ohta
Affiliation:
Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
Kunihito Koumoto
Affiliation:
Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
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Abstract

Ceramic compacts of spinel-type ZnIn2S4 and IIIa-ZnIn2S4 polytype with a layer structure were synthesized by the reaction-sintering of mixed powders of ZnS and In2S3 at 723 K and 1073 K in Ar (containing 1° H2) atmosphere, respectively. The thermoelectric properties were investigated in the temperature range from 473 to 873 K. Thermoelectric figure of merit of the IIIa type was much larger than that of the spinel type, and it was slightly higher than the figure of merit of (ZnO)9In2O3, which is known to show the largest value among the oxide homologous compounds. To improve the thermoelectric properties, a c-plane-oriented sintered body of the IIIa polytype was successfully fabricated by a usual ceramic process. The figure of merit in the direction on the c plane was larger than on the ab plane due to higher electrical conductivity on the c plane and increased with increasing temperature showing the largest value of 1.3 × 10−4 K−1 at 873 K.

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Articles
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Journal of Materials Research , Volume 14 , Issue 11 , November 1999 , pp. 4176 - 4181
Copyright
Copyright © Materials Research Society 1999

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