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ZnO powders were synthesized using (a) the decomposing urea process and (b) crystallization from the suspensions obtained by abrupt mixing of Zn(NO 3 ) 2 and NH 4 OH solutions. The samples were characterized by X-ray powder diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM), microelectrophoresis and BET. Basic zinc carbonate...