Resumo

RATIVA PARADA, Wilson; GOMEZ CUASPUD, Jairo  e  CARDA CASTELLO, Juan. Evaluation of the Perovskite LaFe _0,2 Co _0,8 O ₃. Ciencia en Desarrollo [online]. 2017, vol.8, n.1, pp.119-128. ISSN 0121-7488.

The 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 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.

Palavras-chave : Perovskite Type Structure; Polymerization with Citric Acide; Semiconductor Type Oxide.

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