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New ternary metal nanocrystals of Fe 1 - x PtM x (M = Ru 3+, Sn 2+, or Ni 2+ ) were synthesized by chemical transformation from FePt nanocrystals using a cation redox reaction in a solution. The structure and composition of resulting nanocrystals were characterized by high-resolution transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and X-ray photoemission spectroscopy (XPS). Moreover, X-ray absorption near-edge spectroscopy (XANES) was employed to confirm the chemical transformation from FePt to Fe 1 - x PtRu x nanocrystals. The analyses of extended X-ray absorption find structure (EXAFS) revealed the detailed binding structures and coordination numbers of both FePt and Fe 1 - x PtRu x nanocrystals. The results suggested that iron atoms of FePt lattices were oxidized to be Fe 2+ and Fe 3+ ions and were replaced by ruthenium atoms from the reduction of Ru 3+ ions in solution to form Fe 1 - x PtRu x lattices. Our method has opened a new route to easily and rapidly prepare a solid-solution type of ternary metal nanocrystals for catalytic applications.
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Wang et al. (2007) studied this question.
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