Structural characterization of supported chromium clusters by extended energy-loss fine structure

✍ Scribed by L. Lozzi; M. Passacantando; P. Picozzi; S. Santucci; M. Diociaiuti; L. Paoletti

• Book ID: 104592556
• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 262 KB
• Volume: 16
• Category: Article
• ISSN: 0142-2421
• DOI: 10.1002/sia.740160106

✦ Synopsis

Abstract

The lattice parameters of chromium clusters deposited on carbon substrates were determined by extended energy‐loss fine structure (EXELFS) measurements in transmission mode beyond the L~2, 3~ edges of chromium using an electron microscope. Fourier analysis of the data shows a sizeable lattice parameter contraction when the mean diameter of the clusters decreases. This contraction amounts to ∼5.2% with respect to the bulk value for those clusters with a mean volumetric diameter of ∼13 Å. The behaviour of the nearest‐neighbour‐distance contraction versus cluster diameter agreed with a macroscopic liquid‐drop model.