Paper Type |
Contributed Paper |
Title |
High Temperature Thermoelectric and Optical Properties of Ca3Co4O9 Prepared by Thermal Hydro-Decomposition |
Author |
Natkrita Prasoetsopha [a], Supree Pinitsoontorn*[b],[c], Vittaya Amornkitbamrung [b],[c],[d] |
Email |
psupree@kku.ac.th |
Abstract: The polycrystalline sample of calcium cobalt oxide (Ca3Co4O9) ceramic was prepared by a thermal hydro-decomposition method using the acetate salts as starting materials. The single phase Ca3Co4O9 powder was obtained at the calcined temperature of 1073 K which was confirmed by XRD. The powder exhibited platelet-shape with a particle size of <2 mm. The maximum absorption peak of the powder is 285 nm which showed an indirect band gap of 2 eV using a UV-vis technique. The sintered ceramics showed the Seebeck coefficient of 170 µV/K, the electrical resistivity of 21 mW×cm and the thermal conductivity of 0.036 W/cm/K at 860 K, which were converted to a figure-of-merit, Z, of 3.7×10-5 K-1. The density of the ceramic was 3.08 g/cm3 obtained using an Archimedes method which corresponded to a significant amount of 35% pore observed by SEM on the fractured surface. |
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Start & End Page |
1030 - 1034 |
Received Date |
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Revised Date |
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Accepted Date |
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Full Text |
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Keyword |
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Volume |
Vol.40 No.6 SPECIAL ISSUE 2 |
DOI |
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Citation |
Prasoetsopha N., Pinitsoontorn S. and Amornkitbamrung V., High Temperature Thermoelectric and Optical Properties of Ca3Co4O9 Prepared by Thermal Hydro-Decomposition , Chiang Mai J. Sci., 2013; 40(6): 1030-1034. |
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