Abstract
ZɳMɳO3 nanoparticles system was prepared by the sol-gel auto-combustion method, in order to analyze the structure and magnetic behavior presented in such compound prepared by a new alternative route of synthesis. Structural characterization, bonds, morphology and size were performed by X-ray diffraction (XRD), infrared spectroscopy (IR) and electron microscopy (TEM) and additionally an optical characterization (UV-vis) at room temperature. The XRD study showed that the compound crystallized in a mixed cubic perovskite-wurtzite structure. The IR spectra showed that the compound has energy bands in the bonds related with octahedral; which is attributed to a vibration characteristic of the perovskite ABO3 type, addition to find the absorption bands associated with bonds, characteristic of the presence of structural wurtzite hexagonal phase. An estimated size and morphological analysis was carried out by applying the Scherrer´s formula and Transmission Electron Microscopy (TEM), revealing non-spherical nanoparticles of 16nm in size. The magnetic measurements M(T) were performed using zero-field-cooled (ZFC) and field-cooled (FC) protocols revealing a negative Weiss temperature indicating antiferromagnetic behavior with a Néel temperature of 13K. From the optical characterization was possible to get the energy gap at room temperature of .
Key words: Auto-combustion, antiferromagnetic, manganites, nanoparticles, Néel temperature, perovskite, Sol-Gel, Wurtzite.
