Calcium is partially substituted by bismuth in the Ca3-xBixCoO9+delta (x=0.00, 0.05, 0.10, 0.15, 0.20, and 0.30) system in order to determine how this substitution affects the thermoelectric and magnetic properties of the system. It was determined that the system had a positive thermopower, and thus the main carriers were holes. A maximum thermoelectric figure of merit of 0.091 was achieved with the Ca2.7Bi0.3CoO9+delta sample. The magnetic property test results indicated that ...
Author(s): Ankam Bhaskar, Chia-Jyi Liu, Z.-R. Lin
Calcium is partially substituted by bismuth in the Ca1-xBixMnO3-delta (x=0.00, 0.02, and 0.05) system in order to determine how this substitution affects the electrical resistivity, thermopower, and thermal conductivity. The experimental results were then used to calculate the thermoelectric figure of merit for each sample. The highest observed figure of merit was 0.047, which represented a 487% increase over the unsubstituted sample....
Author(s): Ankam Bhaskar, Chia-Jyi Liu, J. J. Yuan
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
Coal fly ash was used as the base material for the formation of thermal insulation materials. The porosity of the produced materials ranged from 86.3-94.5 vol. %. The insulating materials were prepared by ball milling, followed by foaming assisted by the addition of K12, casting and drying, and finally sintering. No harmful chemicals were released to the environment during their preparation. It was found that the thermal conductivity of the samples ...
Author(s): Heping Zhang, Junjie Feng, Lunlun Gong, Ruifang Zhang, Xudong Cheng, Ye Li
