Thermoelectric properties of n-type Ca1−xDyxMn1−yNbyO3−δ compounds (x = 0, 0.02, 0.1 and y = 0, 0.02) prepared by spray-drying method

We report the high temperature thermoelectric properties of Ca1−xDyxMn1−yNbyO3−δ (x = 0, 0.02, 0.1 and y = 0, 0.02) synthesized by spray-drying method. A maximum power factor (PF) value of 2.65 μW K−2 cm−1 is obtained at 1100 K for CaMn0.98Nb0.02O3−δ. This represents an improvement of about 75% with respect to undoped CaMnO3−δ sample at the same temperature. We also provide a complete structural characterization of the samples.

► Ca1-xDyxMn1-yNbyO3-δ (x = 0, 0.02, 0.1 and y = 0, 0.02) by spray-drying technique
► All samples show small particle grains with a narrow particle size dispersion
► Spray-drying method improves the electrical conductivity of the samples
► Below 400 K, ZT of Ca0.98Dy0.02MnO3-δ is five-times higher than ZT of CaMnO3-δ
► Above 400 K, PF of CaMn0.98Nb0.02O3-δ is 75% increase compared to CaMnO3-δ