The process consisted of two stages, leaching and sintering. The ultrasonic
technique followed by a heterogeneous azeotropic distillation process in the presence of polyethylene
glycol (PEG) was carried to ensure complete elimination of the residual water in the precipitate.
The structural and morphological properties of the calcined nanocrystalline powders were characterized
by X-ray diffractometer (XRD), transmission electron microscope (TEM), Brunauer–Emmett–Teller
nitrogen-gas adsorption method (BET)