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Preparation of Ca3Co4O9 and Improvement of its Thermoelectric Properties by Spark Plasma Sintering

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The precursor powders of Ca3Co4O9 were synthesized by a sol–gel method. The results of X-ray diffraction and thermogravimetric and differential thermal analyses patterns indicate that pure Ca3Co4O9 powders could be obtained by calcining the precursor at 800°C for 2 h. High dense Ca3Co4O9 ceramic samples (∼99% of theoretical density) were prepared by the spark plasma sintering (SPS) method. Compared with the conventional sintering (CS), the SPS samples exhibit much higher electrical conductivity and power factor which are respectively about 118 S/cm and 3.51 × 10−4 W·(m·K2)−1. The SPS method is greatly effective for improving the thermoelectric properties of Ca3Co4O9 oxide ceramics.
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Document Type: Research Article

Affiliations: 1: State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science & Engineering, Tsinghua University, Beijing 100084, China 2: Department of Inorganic Chemistry, Arrhenius Laboratory, Stockholm University, Stockholm S10691, Sweden

Publication date: May 1, 2005

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