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High-temperature electrical transport behaviors in textured Ca3Co4O9-based polycrystalline ceramics
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
2009 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 94, no 7, 072107/1-072107/3 p.Article in journal (Refereed) Published
Abstract [en]

Highly (00l) oriented Ca3Co4O9-based ceramics were fabricated by spark plasma sintering combined with a dynamic forging process. The grain orientation is effective in lowering the electrical resistivity and enhancing the thermoelectric power factor but with little influence on the Seebeck coefficient. A metallic-to-semiconducting transition temperature can be observed and the activation energy is almost independent of the La-doping. All of the Ca3Co4O9-based ceramic samples exhibit large thermoelectric power, and the figure of merit for La-doped Ca3Co4O9 sample can reach 0.26 at 975 K, which can be a promising candidate of p-type material for high-temperature thermoelectric application

Place, publisher, year, edition, pages
2009. Vol. 94, no 7, 072107/1-072107/3 p.
Keyword [en]
mpounds, ceramics, electrical resistivity, forging, high-temperature effects, plasma materials processing, Seebeck effect, sintering, ceramic compounds
National Category
Inorganic Chemistry
Research subject
Inorganic Chemistry
URN: urn:nbn:se:su:diva-36813DOI: 10.1063/1.3086875ISI: 000263599200038OAI: diva2:290363
övrigt antal författare 3st.Available from: 2010-01-26 Created: 2010-01-26 Last updated: 2011-05-13Bibliographically approved

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Shen, Zhijian
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Department of Physical, Inorganic and Structural Chemistry
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