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
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.