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Thermoelectric properties and texture evaluation of Ca3Co4O9 prepared by a cost-effective multisheet cofiring technique

Kwon, O-Jong and Jo, Wook and Ko, Kyeong-Eun and Kim, Jae-Yeol and Bae, Sung-Hwan and Koo, Hyun and Jeong, Seong-Min and Kim, Jin-Sang and Park, Chan (2011):
Thermoelectric properties and texture evaluation of Ca3Co4O9 prepared by a cost-effective multisheet cofiring technique.
In: Journal of Materials Science, pp. 2887-2894, 46, (9), ISSN 0022-2461, [Online-Edition: http://dx.doi.org/10.1007/s10853-010-5163-3],
[Article]

Abstract

Highly textured Ca3Co4O9 thermoelectrics were fabricated by a so-called multisheet cofiring (MSC) technique in combination with the commonly practiced spark plasma sintering (SPS) technique. X-ray diffraction analysis revealed that the MSC technique significantly enhances the degree of texture compared with the conventional SPS technique. This was confirmed by microstructure analysis performed on polished and chemically etched specimens. The power factor and the thermoelectric figure of merit for the specimen produced by the MSC technique were estimated to be ~5.2 × 10−4 W/mK2 and ~0.4, respectively, both of which are ~20% larger than those of the normally processed specimens. A comparative study of the thermoelectric properties, such as electrical resistivity and Seebeck coefficient, clearly demonstrated that texture mainly influences the electrical resistivity and consequently enhances the thermoelectric properties.

Item Type: Article
Erschienen: 2011
Creators: Kwon, O-Jong and Jo, Wook and Ko, Kyeong-Eun and Kim, Jae-Yeol and Bae, Sung-Hwan and Koo, Hyun and Jeong, Seong-Min and Kim, Jin-Sang and Park, Chan
Title: Thermoelectric properties and texture evaluation of Ca3Co4O9 prepared by a cost-effective multisheet cofiring technique
Language: English
Abstract:

Highly textured Ca3Co4O9 thermoelectrics were fabricated by a so-called multisheet cofiring (MSC) technique in combination with the commonly practiced spark plasma sintering (SPS) technique. X-ray diffraction analysis revealed that the MSC technique significantly enhances the degree of texture compared with the conventional SPS technique. This was confirmed by microstructure analysis performed on polished and chemically etched specimens. The power factor and the thermoelectric figure of merit for the specimen produced by the MSC technique were estimated to be ~5.2 × 10−4 W/mK2 and ~0.4, respectively, both of which are ~20% larger than those of the normally processed specimens. A comparative study of the thermoelectric properties, such as electrical resistivity and Seebeck coefficient, clearly demonstrated that texture mainly influences the electrical resistivity and consequently enhances the thermoelectric properties.

Journal or Publication Title: Journal of Materials Science
Volume: 46
Number: 9
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 18 May 2011 15:20
Official URL: http://dx.doi.org/10.1007/s10853-010-5163-3
Identification Number: doi:10.1007/s10853-010-5163-3
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