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http://dx.doi.org/10.3740/MRSK.2008.18.6.313

X-ray Photoelectron Spectroscopy Study of LaFeO3 Powders Synthesized by Solution Combustion  

Hwang, Yeon (Department of Materials Science & Engineering, Eco-Product & Materials Education Center, Seoul National University of Technology)
Kang, Dae-Sik (Department of Materials Science & Engineering, Eco-Product & Materials Education Center, Seoul National University of Technology)
Park, Mi-Hye (Department of Materials Science & Engineering, Eco-Product & Materials Education Center, Seoul National University of Technology)
Cho, Sung-Baek (Korea Institute of Geoscience & Mineral Resources, Minerals & Materials Processing Division)
Publication Information
Korean Journal of Materials Research / v.18, no.6, 2008 , pp. 313-317 More about this Journal
Abstract
[ $LaFeO_3$ ] powders were synthesized using a method involving solution combustion, and the surface properties of these powders were examined by x-ray photoelectron spectroscopy. As the amount of fuel increased during the synthesis, the $LaFeO_3$ powders became amorphous with a large plate-like shape. It was found that the O 1s spectra were composed of two types of photoelectrons by deconvolutioning the spectra. Photoelectrons with higher binding energy come from adsorbed oxygen ($O^-$) whereas those with lower energy come from lattice oxygen ($O^{2-}$). The ratio of adsorbed and lattice oxygen increased as the ratio of the fuel and nitrate (${\Phi}$) increased. The binding energy of both types of oxygen increased as ${\Phi}$ increased due to the formation of carbonates.
Keywords
X-ray photoelectron spectroscopy$LaFeO_3$ solution combustion synthesis; adsorbed oxygen;
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