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In situ time-resolved X-ray absorption spectroscopy was used to observe the first stage of NiO nanoparticle formation. The spectra of Ni K-edge (and their Fourier transforms) during heating show a systematic structural phase transformation (amorphous to crystalline) near 400 °C. Crystallization occurs during heating of solid solution (biopolymer) of nickel dispersed in gelatin. The experimental XANES spectra are compared to ab initio calculations using a multiple-scattering model (code FEFF).
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Meneses et al. (2007) studied this question.
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