Atomic ordering in nanosized Pt xAu 1-x (x = 0, 0.51, 1) by resonant X-ray diffraction and differential atomic pair distribution functions

Valeri Petkov, Sarvjit Shastri, Bridgid Wanjala, Rameshiwori Loukrakpam, Jin Luo, Chuan Jian Zhong

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Resonant X-ray diffraction and differential atomic pair distribution functions method is illustrated with results from a study of 4.5(3) nm Pt, Au and Pt 0.51Au 0.49 particles. By doing experiments at two energies close to the K absorption edge of Pt the atomic correlations relative to Pt and Au atoms in the alloy particles are differentiated. The experimental data show that Pt and Au atoms in all three samples arrange in a face centered cubic type structure while keeping their bond lengths of 2.76 Åand 2.86 Å, respectively, virtually unchanged. This leads to increased local structural distortions in the alloyed Pt 0.51Au 0.49 particles that may affect their catalitic properties substantially.

Original languageEnglish
Pages (from-to)262-267
Number of pages6
JournalZeitschrift fur Kristallographie
Volume227
Issue number5
DOIs
StatePublished - May 2012

Keywords

  • Atomic ordering
  • Nanosized materials
  • Synchrotron X-ray diffraction

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