Abstract
Manganite in the La0.7Sr0.3MnO3 system is of great interest due to its potential application in fuel cells, information storage, magnetic field sensors, non-volatile memories, oxygen sensors, and catalysts in the oxidation of light hydrocarbons. Given the scientific relevance of this material, this study describes the procedure to synthesize and characterize thin films of La0.7Sr0.3MnO3. Manganites were synthesized by means of the Pechini method, and deposited on strontium titanate substrates using spin-coating. Both the crystallinity of the films and their phases were studied with X-ray diffraction (XRD), finding that the films are polycrystalline and have a simple cubic structure with a lattice constant a=3.8653 ± 0.066 Ǻ. Scanning electron microscopy (SEM) showed a uniform surface with good morphological features, and the spectrum resulted from the Energy Dispersive X-Ray Spectroscopy (EDS) analysis over the same film was consistent with the molar ratio of the perovskite. Samples of 2, 4, and 6 layers were synthesized, obtaining thicknesses of 75.10 ± 0.01, 75.02 ± 0.01 and 74.07 ± 0.08 nm per monolayer. The results indicate that this method is useful to synthesize films of high crystalline quality and nanometric size.
Highlights
Manganese oxides type perovskite are of scientific interest due to their potential applications in fuel cells and information storage, and to their diverse advantages, such as miniaturization, long life, and low costs [1,2,3,4,5,6,7]
This paper studies the applicability of the spin coating technique in obtaining manganite La0.7Sr0.3MnO3 thin films, previously synthesized using the Pechini method
The diffraction pattern of the LSMO sample covering the strontium titanate substrate (Fig. 1) was qualitatively analyzed by comparing the observed profile with the diffraction profiles reported in the PDF2.ICDD (International Centre for Diffraction Data) database, following [17]
Summary
Manganese oxides type perovskite are of scientific interest due to their potential applications in fuel cells and information storage, and to their diverse advantages, such as miniaturization, long life, and low costs [1,2,3,4,5,6,7]. LSMO belongs to the family called perovskites, with formula ABO3, where the cation A occupies the cube’s central position; the cations B, the vertices; and the oxygens, the edges’ middle position. Two of the most common methods for synthesizing manganese oxides type LMSO are the ceramic method, and the polymeric complex (Pechini) method, which was developed as a variation of the sol-gel process. The Pechini method allows to prepare highly complex and homogeneous pure materials, and to control the stoichiometry and the possibility of obtaining fibers, powders, and thin films of nanometric size [10] that are the focus of this research
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