Nanoparticles with high surface area of LaMn 1−x Zn x O 3+d (LMZ) (0.0 ≤ x ≤ 0.38) were synthesized by the Pechini-type polymerizable complex technique based on in situ polyesterification between citric acid (CA) and ethylene glycol (EG). Heating at 90 • C of a mixed solution of CA, EG, H 2 O, and nitrates of La, Mn, and Zn, gave a polymeric resin. The polymeric resin or citrate-derived gel was preheated at 450 • C for 2 h to give a powdered precursor of LMZ. The final heat treatment of the powdered precursor was done in static air at a temperature range 700-800 • C for 6 h. After calcinations of the dried gels, the products were characterized by the X-ray powder diffraction technique, Fourier transform infrared analysis, and scanning electron microscopy. The products are of considerable interest both for utilization as catalysts and for their exceptional magnetotransport properties.

New compounds of rare earth complex oxides with perovskite structure in a combination of La with Eu ions and Mn with Zn ions, La 1-x Eu x Mn 0⋅9 Zn 0⋅1 O 3+d (LEMZ) (0⋅0 ≤ x ≤ 0⋅32) in A and B sites, respectively were synthesized. X-ray powder diffraction (XRD), fourier transform infrared spectroscopy (FT-IR) and photoluminescence spectra (PL) were used to characterize the resulting nanoparticles. The powder X-ray diffraction peaks could be indexed as a rhombohedral cell. The results of FT-IR spectra were in agreement with those of XRD. High-quality nanopowders with controlled stoichiometry and microstructure were prepared at a temperature range of 700-800°C for 6 h, with mean particle sizes of ~ 17⋅5 nm. Photoluminescence measurements showed Eu 3+ ions characteristic red emission in crystalline LEMZ powders due to the 5 D 0 → 7 F J (J = 0-6) transitions of the 4f electrons of Eu 3+ ions. The structure, homogeneity and particle size of the obtained compounds during different stages were investigated by scanning electron microscopy (SEM).