Thermoelectric materials are currently being researched as a source of energy in order to reduce carbon dioxide emissions. The efficiency of these materials depends on their Seebeck coefficient, electrical resistivity, and thermal conductivity, as well as the absolute temperature. Cobalt oxides (Ca3Co4O9+delta) have been researched extensively as potential thermoelectric materials because of their high Seebeck coefficient and low electrical resistivity and thermal conductivity. Systems have been studied ...
Author(s): Ankam Bhaskar, Chia-Jyi Liu, Z.-R. Lin
The low-temperature thermoelectric properties of Ca3-xDyxCo4O9+delta systems (x = 0, 0.02, 0.05, and 0.10). It was determined that these systems produced positive thermopower, indicating that the dominant carriers were holes. The electrical resistivity and thermal conductivity were found to decrease with increasing Dy3+ content, and the thermopower was found to increase. The highest calculated thermoelectric figure of merit was 0.044, and this was calculated for the Ca2.9Dy0.1Co4O9+delta sample....
Author(s): Ankam Bhaskar, C.-S. Jhang, Chia-Jyi Liu
The authors present a method of producing Cu2CdSnSe4 quaternary nanocrystals using a colloidal synthesis route that could be used for future industrial synthesis. The nanocrystals prepared showed great potential for use as a thermoelectric material due to their high thermoelectric figure of merit (up to 0.71) resulting from a high electrical conductivity and low thermal conductivity. The authors believed that these properties could be further tuned in order to increase ...
Author(s): Alejandro PC)rez-RodrC-guez, Alejandro Perez-RodriB-guez, Alexey Shavel, Andreu Cabot, Andrew Fairbrother, Doris Cadavid, Joan Daniel Prades, Joan Ramon Morante, Jordi Arbiol, Maria Ibanez, Nuria GarcC-a-CastellC3, Nuria GarciB-a-Castello, Reza Zamani, Victor Izquierdo-Roca, Wenhua Li
Autoclaved aerated concrete was studied because it has potential to be used in the design of energy-efficient buildings. Three different samples were tested, each with a unique density. Of particular interest to this work was the thermal conductivity of the samples, as this material would be used as a thermally insulating concrete. The thermal conductivities were measured at various percentages of moisture content, and it was found that increasing moisture ...
Author(s): Hong-Qing Jin, Li-Wu Fan, Xiao-Li Yao, Xu Xu, Zi-Tao Yu
The laser floating zone method was used to prepare Pb doped Bi2-xPbxBa2Co2Oy thermoelectric materials with x=0, 0.2, 0.4, and 0.6. The highest power factor reported was obtained at 650oC for the 0.2 Pb doped samples. This value was higher than that for pure laser grown Bi2Ba2Co2Oy materials. The thermal conductivity was decreased, as is desired in thermoelectric materials....
Author(s): A. Sotelo, F. M. Costa, J. C. Diez, J. S. Amaral, M. A. Madre, M. A. Torres, N. M. Ferreira, S. I. R. Costa, Sh. Rasekh, V. S. Amaral
