ResumenSe sintetizó el cerámico LaFe 0,2 Co 0,8 O 3 , usando el método de polimerización con ácido cítrico. Las caracterizaciones de los precursores con espectroscopia infrarroja (FT-IR), ultravioleta visible (UV-vis), y análisis térmicos (TGA-DTA), revelaron la presencia de especies tipo citrato y la consolidación de una estructura estable a partir de los 700 • C. Análisis de difracción de rayos X (XRD), energía dispersiva de rayos X (EDX), microscopia electrónica de barrido (SEM) y espectroscopia Raman, confirmaron la consolidación de un sistema cristalino tipo LaCoO 3 de fase simple romboédrica, una superficie homogénea y porosa, y tamaño de partícula nanométrico. La evaluación mediante espectroscopia de impedancias (IS), desde temperatura ambiente hasta 900 • C, mostró un material con alta conductividad eléctrica y comportamiento semiconductor.Palabras clave: Estructura tipo perovskita, Polimerización con ácido citrico, Óxido semiconductor. AbstractThe LaFe 0.2 Co 0.8 O 3 ceramic was synthesized using polymerization with citric acid method. Characterizations of the precursors with Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-vis), and thermal analysis (TGA-DTA), revealed the presence of species citrate type, and formation of a stable structure from up to 700 • C. Analysis by means of X-ray diffraction (XRD), energy dispersive X-ray (EDX), scanning electron microscopy (SEM) and Raman spectroscopy, confirmed the consolidation of a crystal system LaCoO 3 type, of rhombohedral single phase, with homogeneous and porous surface and nanometer particle size. The evaluation by impedance spectroscopy (IS) from room temperature to 900 • C, showed a material with good electrical conductivity and semiconductor type behavior.
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