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Structural analysis of nano-transition-metal-oxides

Shamoto, Shinichi  ; Iikubo, Satoshi; Kodama, Katsuaki   ; Taguchi, Tomitsugu; Koyanaka, Hideki*; Takeuchi, Ken*; Kohara, Shinji*; Loong, C.-K.*; Proffen, T.*

Local crystal structures of nano-transition-metal-oxide powder samples, such as manganese oxide and titanium oxide, have been studied by the atomic pair distribution function (PDF) analysis of X-ray and neutron powder diffraction data. For example, the nano-manganese-oxide (nano-Mn-O) sample with unknown crystal structure shows ultrahigh efficiency as a gold adsorbent even from ppt-level aqueous solutions such as the seawater. For the nanomaterials, there are various difficulties to determine the crystallographic parameters. Instead of fitting broad diffraction peaks, the PDF reveals relatively sharp features at short interatomic distances. For example, by analyzing the peak areas in absolute scale, a valence of a manganese ion or an atomic fraction of manganese ion in the nano-Mn-O sample, MnO$$_{x}$$, can be determined.

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