Characteristics of Perovskites ReNiO3 (Re = La and Nd) Prepared by Solid State Reaction in the Ambient of Oxygen

In the proposed method, we could complete the synthesis with only 3 h of thermal treatment, which is relatively fast in comparison to the previously reported procedure, without an expensive gascontrolled chamber system. The compound comprises Re2O3 and NiO3 powders that were mixed thoroughly in a stoichiometric ratio in a ball mill for 24 h and then dried in an oven at a 100 °C. The powder mixture was quickly calcined at various temperature for at least 3 h in an oxygen gas flow compared to conventional annealing method. After calcination at 1100 °C, the detected XRD peaks matched well with peaks of the standard ABO3 perovskite structure. Moreover, EDX and FT-IR spectral analysis results confirmed that the mixture had formed stoichiometry ReNiO3. All prepared samples comprised plate-like grains with a random orientation, and their average particle size was in the range of 1 to 3 μm calculated from FE-SEM images.