Stacking fault density and bond orientational order of fcc ruthenium nanoparticles

Okkyun Seo, Osami Sakata, Jae Myung Kim, Satoshi Hiroi, Chulho Song, Loku Singgappulige Rosantha Kumara, Koji Ohara, Shun Dekura, Kohei Kusada, Hirokazu Kobayashi, Hiroshi Kitagawa

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

We investigated crystal structure deviations of catalytic nanoparticles (NPs) using synchrotron powder X-ray diffraction. The samples were fcc ruthenium (Ru) NPs with diameters of 2.4, 3.5, 3.9, and 5.4 nm. We analyzed average crystal structures by applying the line profile method to a stacking fault model and local crystal structures using bond orientational order (BOO) parameters. The reflection peaks shifted depending on rules that apply to each stacking fault. We evaluated the quantitative stacking faults densities for fcc Ru NPs, and the stacking fault per number of layers was 2-4, which is quite large. Our analysis shows that the fcc Ru 2.4 nm-diameter NPs have a considerably high stacking fault density. The B factor tends to increase with the increasing stacking fault density. A structural parameter that we define from the BOO parameters exhibits a significant difference from the ideal value of the fcc structure. This indicates that the fcc Ru NPs are highly disordered.

Original languageEnglish
Article number253101
JournalApplied Physics Letters
Volume111
Issue number25
DOIs
Publication statusPublished - Dec 18 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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