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Thermoelectric Generator Using Local Mineral MnO-Fe2O3-SiO2-BaO-Al2O3-Others

Areerat Dawongsa, Kitsana Lamsombat, Chartchai Bunyattarkoon, and Weerasak Somkhunthot
Program of Physics, Department of Science, Faculty of Science and Technology, Loei Rajabhat University, Thailand
Abstract—MnO-Fe2O3-SiO2-BaO-Al2O3-others mineral has been found in Loei Province, Thailand, and was prepared in bulk solid form for determining thermoelectric properties and efficiencies. Charge carrier type and Seebeck coefficient were measured by hot probe method. Electrical resistivity can be estimated from current and voltage characteristics. Steady state technique is used to find thermal conductivity. Power factor and figure of merit were calculated. Results of Determinations at room temperature in air found that a bulk sample (0.30 cm width, 0.40 cm length, 2.00 cm height and 2.63 g/cm3 density) showed n-type material. Seebeck coefficient, electrical resistivity and thermal conductivity were about -10-3 V/K, 103 Ωm, and 102 W/mΩK, respectively. Power factor of ~10-9 W/m×K2 and figure of merit of ~10-11 K-1 were obtained. Making thermoelectric generator coposed of ten bulks, which connected electrically in series but thermally in parallel. Preliminary test indicated that the open circuit voltage increased with increasing temperature difference from 9.3 mV at9 K up to66.0 mV at88 K. While the internal resistance decreased from 14.9 MΩ to 4.5 MΩ. This test demonstrated that a built generator can be generated the electricity. Therefore, it can be used as an important platform for further research and development of thermoelectric technology.

Index Terms —MnO-Fe2O3-SiO2-BaO-Al2O3, thermoelectric properties and efficiencies, thermoelectric generator

Cite: Areerat Dawongsa, Kitsana Lamsombat, Chartchai Bunyattarkoon, and Weerasak Somkhunthot, "Thermoelectric Generator Using Local Mineral MnO-Fe2O3-SiO2-BaO-Al2O3-Others," Jounal of Automation and Control Engineering, Vol. 2, No. 2, pp. 166-170 June, 2014. doi: 10.12720/joace.2.2.166-170
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