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Improvement in High-Temperature Thermoelectric Properties by Adding Mn for Co in Ca3Co4O9

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Abstract:

Nano-sized Ca3Co4−xMnxO9 (0 ≦ x ≦ 0.6) thermoelectric powders were synthesized by solution combustion method, using aspartic acid as fuel. The microstructure and high-temperature (500–800 °C) thermoelectric properties of the Ca3Co4−xMnxO9 were investigated. The addition of Mn for Co in Ca3Co4−xMnxO9 resulted in a decrease of the electrical conductivity and a significant increase of the Seebeck coefficient. Consequently, the power factor was remarkably enhanced by the addition of Mn. Ca3Co3.7Mn0.3O9 sample showed the highest value of the power factor (1.24 × 10−4 Wm−1K−2) at 800 °C. We believe that the Ca3Co4−xMnxO9 is strongly desirable as a novel high-temperature thermoelectric material for power generation.

Keywords: ELECTRICAL CONDUCTIVITY; NANOPOWDERS; POWER FACTOR; THERMOELECTRIC MATERIAL

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2010.2784

Publication date: November 1, 2010

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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