Atomic ordering in nanosized PtxAu1-x (x=0, 0.51, 1) by resonant X-ray diffraction and differential atomic pair distribution functions

作者:Petkov Valeri*; Shastri Sarvjit; Wanjala Bridgid; Loukrakpam Rameshiwori; Luo Jin; Zhong Chuan Jian
来源:Zeitschrift fur Kristallographie, 2012, 227(5): 262-267.
DOI:10.1524/zkri.2012.1466

摘要

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 Pt0.51Au0.49 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 angstrom and 2.86 angstrom, respectively, virtually unchanged. This leads to increased local structural distortions in the alloyed Pt0.51Au0.49 particles that may affect their catalitic properties substantially.

  • 出版日期2012