X-RAY-ABSORPTION FINE-STRUCTURE STUDY ON COORDINATION STATE OF IMPLANTED GOLD IONS IN SILICA GLASS

Citation
K. Fukumi et al., X-RAY-ABSORPTION FINE-STRUCTURE STUDY ON COORDINATION STATE OF IMPLANTED GOLD IONS IN SILICA GLASS, Journal of materials research, 13(9), 1998, pp. 2649-2654
Citations number
32
Categorie Soggetti
Material Science
ISSN journal
08842914
Volume
13
Issue
9
Year of publication
1998
Pages
2649 - 2654
Database
ISI
SICI code
0884-2914(1998)13:9<2649:XFSOCS>2.0.ZU;2-1
Abstract
Coordination state of gold atoms implanted in silica glass to an energ y of 1.5 MeV and a dose of 1 x 10(17) ions/cm(2) has been studied by x -ray absorption fine structure spectroscopy. It was found that most of the gold atoms form gold clusters in which the nearest neighboring Au -Au interatomic distance is shorter by 0.05 Angstrom than that in bulk gold. The contraction of Au-Au interatomic distance of gold clusters in silica glass is less than that reported in the previous studies on gold clusters within the other substrates. Gold atoms are coordinated by about four gold atoms in average. In addition, it was found that Au -O bonds are formed at the gold clusters/silica glass interface. It wa s deduced that the formation of Au-O bond at the gold clusters/silica glass interface depresses the contraction of Au-Au interatomic distanc e.