Síntese e caracterização do zirconato de cálcio (CaZrO3)

Abstract

Perovskite compounds, such as Calcium Zirconate, have ABO3 structural formula and form a class of materials with well-defined optical, magnetic and electrical properties, which has several scientific and technological applications. The perovskites will be portrayed in this work, because they present physicochemical stability and well defined specific properties. Therefore, this work aims to analyze the synthesis of perovskites by the combustion method, performing the characterization of the samples by means of X-ray diffraction (XRD), Rietveld refinement, Scanning Electron Microscopy (SEM), Dispersive Energy Spectroscopy EDX or EDS) and X-ray Fluorescence. The evolution of the CaZrO3 crystallization process and the composition of the samples were accompanied by X-ray diffraction. The obtained X-ray patterns were refined with the Rietveld method. Scanning electron microscopes were used to identify the presence of defects and morphology of the samples. The characterization methods showed structural differences in the samples in function of the variation of the composition of the system. The results indicate a transition from deep defects to shallow defects due to the presence of secondary phases in the system.