Study of the Internal Compositions of Binary Alloy Pd-Rh Nanoparticles by Using Bragg Coherent Diffraction Imaging

Kawaguchi, Tomoya; Cha, Wonsuk; Latyshev, Vitalii; Vorobiov, Serhii; Komanicky, Vladimir; You, Hoydoo

doi:10.3938/jkps.75.528

Title: Study of the Internal Compositions of Binary Alloy Pd-Rh Nanoparticles by Using Bragg Coherent Diffraction Imaging

Journal Article · Thu Oct 10 00:00:00 EDT 2019 · Journal of the Korean Physical Society

DOI:https://doi.org/10.3938/jkps.75.528· OSTI ID:1572081

Kawaguchi, Tomoya ^[1]; Cha, Wonsuk ^[2]; Latyshev, Vitalii ^[3]; Vorobiov, Serhii ^[3]; Komanicky, Vladimir ^[3]; You, Hoydoo ^[2]

Argonne National Lab. (ANL), Argonne, IL (United States); Tohoku Univ., Sendai (Japan)
Argonne National Lab. (ANL), Argonne, IL (United States)
Safarik Univ., Kosice (Slovak Republic)

Bragg coherent diffraction imaging (BCDI), a well-established technique for imaging the internal strain of nanoparticles, was used to image the internal compositional distribution of binary alloys in thermal equilibrium. The images experimentally obtained for Pd-Rh alloy nanoparticles are presented and discussed. A direct correspondence between the lattice strain and the compositional deviation is discussed with the derivation of the BCDI displacement field aided by illustrations. The correspondence suggests that the longitudinal derivative of the displacement field, the strain induced by compositional heterogeneity, can be quantitatively converted to 3D images of the compositional deviation from the particle average by using Vegard’s law. It also suggests that the transverse derivative can be qualitatively associated with the disorder of Bragg planes. The studied Pd-Rh alloy nanoparticle exhibited internal composition heterogeneity; the Rh composition tends to be high at edges and corners between facets and gradually decreases from the surface to the core of the particle.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; Slovak Research and Development Agency (SRDA); Japan Society for the Promotion of Science (JSPS); European Union (EU)