1 Department of Energy Conversion and Storage, Technical University of Denmark2 Electrofunctional materials, Department of Energy Conversion and Storage, Technical University of Denmark3 Hue University’s College of Education4 Hanoi University of Science and Technology
Polycrystalline Ca1-xYxMnO3 (x = 0.0; 0.1; 0.3; 0.5; 0.7) and Ca0.9Y0.1-yFeyMnO3 (y = 0.00; 0.01; 0.03; 0.05) compounds were prepared by solid-state reaction. X-ray diffraction (XRD) analysis revealed all XRD peaks of all the samples as identical to the orthorhombic structure. The thermoelectric properties of these compounds were investigated from 300 K to 1200 K. It was found that the studied samples are n-type thermoelectric material with thepower factor (PF) of the undoped (x = 0.0) sample was 1.8 × 10-4 Wm1 K2 at about 1150 K and the PF of x = 0.1 sample was 1.0 × 10-4 Wm1 K2 in the temperature range of (300 K ÷ 850 K), it was higher than the PF of the x = 0.0 sample in the same temperature range. With the system of Ca0.9Y0.1-yFey MnO3, the power factor of the y = 0.01 sample was 1.4× 10-4 Wm-1K-2 at 950 K, it was higher than that for the undoped sample CaMnO3 in the temperature range of (300 K ÷ 950 K).
Journal of Science and Technology, 2012, Vol 50, Issue 1B, p. 335-341
Thermoelectric materials; Perovskite oxides; Thermopower; Power Factor; Structural distortion