Evaluación del cerámico con estructura tipo perovskita LaFe0,2Co0,8O3 / Evaluation of the perovskite LaFe0.2Co0.8O3

Wilson Rativa Parada, Jairo Gómez Cuaspud, Juan Carda castelló

Resumen


Resumen

Se sintetizó la perovskita LaFe0,2Co0,8O3, 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 LaCoO3 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.

 

Abstract

The perovskite LaFe0.2Co0.8O3 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 LaCoO3 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.



Palabras clave


Estructura tipo perovskita, Polimerización con ácido citrico, Óxido semiconductor. / Perovskite Type Structure, Polymerization with Citric Acid, Semiconductor Type Oxide.

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Referencias


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DOI: https://doi.org/10.19053/01217488.v8.n1.2017.4748

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