Ca3Co4-xMnxO9+δ (x = 0.00, 0.05, 0.10, and 0.15) sample were prepared by conventional solid state synthesis. The thermoelectric properties were measured at 15 K-300 K. The XRD results revealed that all the samples are single phase. The thermopower of all the samples was positive, indicating that the predominant carriers were holes over the entire temperature range. Both the electric resistivity and the thermopower increased with increasing Mn content. Ca3Co 3.95Mn0.05O9+δ had the highest power factor of 3.40 μW cm-1 K-2 at 163 K, representing an improvement of about 187 % compared to undoped Ca3Co 4O9+δ. These results suggested that there is scope for improving the thermoelectric characteristics via partial substitution of Mn for Co.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Mechanics of Materials
- Electrical and Electronic Engineering
- Materials Chemistry