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Decreased thermal conductivity in Bi2Sr2Co2Ox bulk materials prepared by partial melting

Published online by Cambridge University Press:  18 April 2016

Emmanuel Combe ,
Ryoji Funahashi ,
Tristan Barbier ,
Feridoon Azough  and
Robert Freer
Emmanuel Combe
Affiliation:
Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology, Ikeda, Osaka 563-8577, Japan
Ryoji Funahashi*
Affiliation:
Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology, Ikeda, Osaka 563-8577, Japan
Tristan Barbier
Affiliation:
Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology, Ikeda, Osaka 563-8577, Japan
Feridoon Azough
Affiliation:
Material Science Center, School of Materials, University of Manchester, Grosvenor Street, Manchester M13 9PL, UK
Robert Freer
Affiliation:
Material Science Center, School of Materials, University of Manchester, Grosvenor Street, Manchester M13 9PL, UK
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Bi2Sr2Co2Ox (BSC-222) bulk materials have been prepared in air by single hot pressing or partial melting followed by hot pressing. Thermal transport properties of as-prepared samples were compared with BSC-222 samples prepared by single partial melting. Samples prepared through hot pressing have a high bulk density and improved preferential grain orientation. Bulk density and preferential grain orientation are significantly better in samples processed by partial melting followed by hot pressing. In samples prepared by partial melting, the presence of sub-micrometer-sized secondary phases Bi0.75Sr0.25Ox, Sr-based oxide, and CoO, is observed. The lattice contribution to the total thermal conductivity decreases significantly in partially melted BSC-222 samples. By using a classical phonon transport model, this result demonstrates that the decrease in lattice thermal conductivity in partially melted BSC-222 samples may be linked not only to porosity but also to the presence of defects, induced by partial melting process, which may play an important role in phonon scattering.

Keywords

thermoelectricitythermal conductivitymicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 9 , 14 May 2016 , pp. 1296 - 1305
Copyright
Copyright © Materials Research Society 2016 

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