Obtaining calcium and terbium manganites by the chemical co-precipitation method
Abstract
This paper presents the synthesis and characterization of calcium and terbium manganite (TbxCa1-xMnO3) at different concentrations of the value of x (0.35, 0.40 and 0.45) by means of the synthesis method called chemical coprecipitation. The manganites were obtained starting from precursor salts of Ca(NO3)2.4H2O, Mn(NO3)2.H2O and Tb(NO3)3.5H2O dissolved in ethanol, originating homogeneous mixtures and their precipitation at pH 10. To obtain a good dispersion of the particles, the powders obtained, before being thermally treated, were subjected to an ultrasound bath and filtered. Subsequently, its crystalline structure was determined by X-ray diffraction (XRD), its distribution and particle size by particle size analysis (ATP), and finally its morphology by Scanning Electron Microscopy (SEM), respectively. The results showed that the samples present a pure phase of an orthorhombic space group crystal structure (pnmb). By means of ATP, average particle sizes between 5.356, 7.775 and 66.44 mm, respectively, were obtained. Finally, by scanning electron microscopy, a spherical and mostly homogeneous morphology was found.
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