Syntheses of bismuth titanate templates obtained by the molten salt method
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Data
2013-09-01
Autores
Ranieri, M. G A [UNESP]
Aguiar, E. C. [UNESP]
Cilense, M. [UNESP]
Simões, A. Z. [UNESP]
Varela, José Arana [UNESP]
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Resumo
Bismuth titanate templates (Bi4Ti3O12) were synthesized by the molten salt method in Na2SO4 and K2SO4 fluxes, using an amorphous Bi4Ti 3O12 precursor and a mechanically mixed Bi 2O3+TiO2 mixture as the starting materials. The templates were characterized by means of X-Ray Diffraction, FT-IR, FT-Raman, FEG-SEM and TEM. The templates are free of secondary phases and present orthorhombic structure with orientation in the c-plane. FT-IR suggests no traces of sulfate groups revealing that the molten salt synthesis was beneficial for elimination of inorganic species and for the arrangement of individual nanocrystals into ordered lattices. FEG-SEM analyses of BIT templates revealed that most of the grains were homogeneous with a length of 3.1 μm and a width of 0.3 μm and had plate-like morphology. TEM investigations show that the c-axis of the perovskite units is parallel to the thickness direction of the grains and no liquid-phase was formed during BIT phase formation. © 2013 Elsevier Ltd and Techna Group S.r.l.
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Palavras-chave
A. Ceramics, B. Chemical syntheses, B. Powder metallurgy, C. X-ray diffraction, Bismuth titanate, Inorganic species, Molten salt method, Molten salt synthesis, Orthorhombic structures, Plate-like morphology, Thickness direction, Amorphous materials, Bismuth, Fluxes, Powder metallurgy, Titanium compounds, X ray diffraction, Fused salts
Como citar
Ceramics International, v. 39, n. 7, p. 7291-7296, 2013.