A few compositions co-doped with Gd3+ and La3+, Ce0·80Gd0·20−xLaxO1·90 (0 ≤ x ≤ 0·2) have been prepared by microwave-assisted synthesis (MAS). Thermal response of the as-prepared samples has been studied using simultaneous differential thermal analysis and thermogravimetric analysis. Samples have been characterized using powder X-ray diffraction, Fourier transform infrared spectroscopy (FT-IR) and AC impedance spectroscopy. All the samples, calcined at 400°C for 2 h, show formation of single-phase solid solution having fluorite structure similar to ceria. FT-IR spectroscopy shows that there is no noticeable change in the bonding. MAS technique lowers the sintering temperature to 1300°C and gives more than 95% of the theoretical density. Impedance measurements have been performed on the sintered pellets coated with silver paint, in the temperature and frequency ranges 200–500°C and 1 Hz–1 MHz, respectively. Total conductivity and activation energy of conduction show that co-doped compositions have higher conductivity than the undoped and singly doped samples.
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