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http://dx.doi.org/10.3740/MRSK.2006.16.5.312

Thermoelectric Properties of Binary Skutterudite CoSb3 Prepared by Encapsulated Induction Melting  

You, Sin-Wook (Research Center for Sustainable ECo-Devices and Materials(ReSEM), Chungju National University)
Jung, Jae-Yong (Department of Materials Science and Engineering/ReSEM, Chungju National University)
Ur, Soon-Chul (Department of Materials Science and Engineering/ReSEM, Chungju National University)
Kim, Il-Ho (Department of Materials Science and Engineering/ReSEM, Chungju National University)
Publication Information
Korean Journal of Materials Research / v.16, no.5, 2006 , pp. 312-317 More about this Journal
Abstract
Binary skutterudite $CoSb_3$ compounds were prepared by the encapsulated induction melting (EIM) process, and their thermoelectric, microstructural and mechanical properties were examined. Single-phase ${\delta}-CoSb_3$ was successfully produced by the EIM and subsequent heat treatment at 773 K-873 K for 24 hours in vacuum. Seebeck coefficient increased with increasing heat treatment temperature up to 673 K, showing the positive signs in the range of measuring temperature. However, the samples heat-treated at 773 K-873 K showed negative Seebeck coefficient from room temperature to 400 K, while it showed positive signs above 400 K. Electrical resistivity decreased with increasing temperature, showing typical semiconducting conductivity. Thermal conductivity decreased drastically with increasing heat-treatment temperature. This is closely related with the phase transition to ${\delta}-CoSb_3$.
Keywords
$CoSb_3$; thermoelectric; skutterudite; encapsulated induction melting;
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