Obtention of the fase perovskite via microemulsionObtention of the fase perovskite via microemulsion
Godoi, Ricardo Henrique Moreton
Zorel Junior, Henrique Emilio
Faculty of Sciences. Chemistry
Department of Chemistry
27(2002), p. 125-139
University of Antwerp
The present work focuses on the synthesis of small particles of the perovskite phase of BaMnO3 through the route of conventional coprecipitation (RCC) and the method of conventional microemulsion (MCM). The techniques used for samples characterization were: scanning electron microscopy (SEM), X-ray diffraction patterns (XRD), thermogravimetry (TG) and differential thermal analysis (DTA). The synthesis of materials in self-organized colloidal system has as main objective to increase the shape and size homogeneity of the particles. In the last years it has been intensified the search for more homogeneous materials. The microemulsion route is an alternative method for the synthesis of more homogeneous material because it allows for controlling the relationship of water to surfactante concentrations, (w), which controls the average size of the microemulsion drops. Pure perovskite BaMnO3 phase obtained from microemulsion appears at smaller temperature than the precipitated one, and results in a better size distribution of the particles, around 0.1 mm in diameter compared to 0.5 mm obtained by coprecipitation.