Resumo

NIETO, Adriana et al. Effect of cationic substitution on the structural, microstructural and magnetic properties of bifeo₃ system. Rev. LatinAm. Metal. Mater. [online]. 2016, vol.36, n.2, pp.144-154. ISSN 0255-6952.

This paper presents the effect on the structural characteristics and magnetic properties of replacement of cations occupying sites A and B, in the crystal structure of BiFeO₃ (BFO) in their structural and magnetic properties. The citrate gel method was used to synthesize powders of the systems Bi_1-xLa_xFeO₃ with (x = 0.10, 0.15, 0.20), BiFe_1-yCo_yO₃ (y = 0.03, 0.06, 0.09) and Bi_1-xLa_xFe_1-yCo_yO₃ with x = 0.10, 0.15, 0.20 and y = 0.03). The obtained powders were subjected to a leaching process to minimize unwanted phases. It was observed, using structural characterization by X-ray diffraction, and morphological characterization by scanning electron microscopy, that cationic substitution alters the crystal structure and the particle size of BFO. Addition of lanthanum and cobalt generates ferromagnetic behaviour reflected in magnetic hysteresis curves obtained at room temperature.

Palavras-chave : gel-citrate; XRD; SEM; BFO; ferromagnetism.

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