New co-precipitation technique for the preparation of mixed-oxides

Article abstract of DOI:10.1016/0025-5408(92)90208-H

Fine ceramic oxide powders of the composition MN₂O₄ [spinels, where M = Ni(II), Zn(II), Co(II), Cd(II) and N = Fe(III), Cr(III)], M₃Fe₅O₁₂ [garnets, where M = Y, Gd] and RBa₂Cu₃O_7+δ [ceramic superconductors, where R = rare earths] have been synthesized through a novel coprecipitation technique. The novelty of this route lies in its simplicity and cost-effectiveness. The coprecipitation has been done using a mixture of (NH₄)₂CO₃/(NH₄)HCO₃, triethylamine and formaline in the presence of soluble polymers such as polyvinyl alcohol (PVA). The final product formation is confirmed and characterized by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX).