A simple and efficient preparation of LaFeO3 nanopowders by glycine-nitrate process: Effect of glycine concentration |
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Authors: | Rajender R. Kondakindi Kunal KaranBrant A. Peppley |
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Affiliation: | Queen's-RMC Fuel Cell Research Centre, 945 Princess St., Kingston, Ontario, Canada K7L 5L9 |
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Abstract: | LaFeO3 perovskites have been prepared by the glycine-nitrate process (GNP) at various glycine-to-nitrate molar ratios. The perovskites have been systematically characterized by X-ray diffraction, BET surface area, scanning electron microscopy, transmission electron microscopy and temperature-programmed reduction to study the effect of glycine concentration on various properties of LaFeO3. The X-ray diffraction patterns of the as-prepared and calcined samples show the formation of orthorhombic phase without any impurities. The BET specific surface areas of various perovskites increased with an increase in glycine-to-nitrate ratio (GNR) of 2.0 but were nearly constant at higher ratios. The scanning electron microscopy indicates that the prepared material is flake-like at GNRs ≤1.5 and exists as agglomerated particles at GNRs ≥2.0. The particle size of the as-prepared samples was in the range of 30-130 nm depending on the GNR and the calcined samples exhibited particle size in the range of 60-160 nm. The samples that were prepared at GNR < 1.5 did not show any peaks in temperature-programmed reduction, but the samples prepared at a GNR of 2.0 and above showed the reduction of Fen+. |
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Keywords: | LaFeO3 Combustion X-ray diffraction Surface area Particle size Reducibility |
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