Improvement in High-Temperature Thermoelectric Properties by Adding Mn for Co in Ca3Co4O9
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.
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Document Type: Research Article
Publication date: 2010-11-01
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