3 years ago

Discovery of Hexagonal Structured Pd–B Nanocrystals

Discovery of Hexagonal Structured Pd–B Nanocrystals
Tomokazu Yamamoto, Satoru Yoshioka, Hiroshi Nakanishi, Takeharu Sugiyama, Shogo Kawaguchi, Hiroshi Kitagawa, Yoshiki Kubota, Mikihiro Hayashi, Hirokazu Kobayashi, Syo Matsumura, Keigo Kobayashi, Mitsuhiko Maesato
We report on hexagonal close-packed (hcp) palladium (Pd)–boron (B) nanocrystals (NCs) by heavy B doping into face-centered cubic (fcc) Pd NCs. Scanning transmission electron microscopy–electron energy loss spectroscopy and synchrotron powder X-ray diffraction measurements demonstrated that the B atoms are homogeneously distributed inside the hcp Pd lattice. The large paramagnetic susceptibility of Pd is significantly suppressed in Pd–B NCs in good agreement with the reduction of density of states at Fermi energy suggested by X-ray absorption near-edge structure and theoretical calculations. A change in behavior: Hexagonal close-packed (hcp) Pd–B nanocrystals (NCs) are synthesized by B doping into face-centered cubic (fcc) Pd NCs. Analyses (HR-HAADF-STEM, EELS and synchrotron PXRD) of Pd–B NCs demonstrate that B atoms are homogeneously distributed inside an hcp Pd lattice. The large paramagnetic susceptibility of Pd NCs is suppressed in Pd–B NCs, in good agreement with the reduction of density of states at Fermi energy suggested by XANES and theoretical calculations.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201703209

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