Síntesis en medio poli-alcohólico y caracterización de Perovskitas BaHfO3 y BaZrO3

AUTOR(ES)

Villanueva-Ibáñez, M., Hernández-Pérez, M. A., Rivera Arzola, P. N., Flores-González, M. A.

FONTE

Matéria (Rio J.)

DATA DE PUBLICAÇÃO

2013-12

RESUMO

Perovskite materials (ABO3) present considerable technological interest, their properties depend on the A and B elements. A variety of methods have been used for the elaboration of perovskite materials. In the present paper we present the results of the BaHfO3 and BaZrO3 obtained by polyol method. Inorganic salts of barium and hafnium or zirconium were dissolved in di-etilenglicol and the products were heat treated at 700 °C and 900 °C. X-ray diffraction revealed the cubic structure perovskite-type and diffractions corresponding to the secondary phases of BaCO3 and MO2 (M=Hf or Zr). The spectra obtained by FTIR show the presence of BaCO3. At 700 °C, the scanning electronic microscopy observations revealed a very compact morphology conformed by smaller sub-structures in the form of wire with a diameter around to 900 nm. At 900 °C it was observed a remarkable change in the morphology with dispersed materials conformed by small particles. Transmission electronic microscopy showed that the materials annealed at 900 °C are constituted by small crystals with size lower than 15 nm.

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