Al K-Edge Near-Edge X-ray Absorption Fine Structure (NEXAFS) Study on the Coordination Structure of Aluminum in Minerals and Y Zeolites

1999 ◽  
Vol 103 (36) ◽  
pp. 7557-7564 ◽  
Author(s):  
J. A. van Bokhoven ◽  
H. Sambe ◽  
D. E. Ramaker ◽  
D. C. Koningsberger
Keyword(s):  
Fine Structure ◽  
Coordination Structure ◽  
Y Zeolites ◽  
X Ray ◽  
Absorption Fine ◽  
X Ray Absorption

X-ray absorption fine structure study on the formation of Cu–Br bonds in (Br + Cu) ion implanted silica glass

2003 ◽  
Vol 18 (4) ◽  
pp. 885-894 ◽  
Author(s):  
Kohei Fukumi ◽  
Akiyoshi Chayahara ◽  
Atsushi Kinomura ◽  
Hiroyuki Kageyama ◽  
Kohei Kadono ◽  
...  
Keyword(s):  
Fine Structure ◽  
Mass Transport ◽  
Silica Glass ◽  
Structure Study ◽  
Transport Processes ◽  
Coordination Structure ◽  
X Ray ◽  
Absorption Fine ◽  
X Ray Absorption ◽  
Thermochemical Stability

The valence and coordination structure of implanted Cu and Br ions were investigated by x-ray absorption fine structure spectroscopy in (2.4 MeV 6 × 1016 Br2+ ions cm−2+ 2 MeV 6 × 1016 Cu+ ions cm−2)-implanted silica glass. It was found that the implanted Cu and Br atoms were coordinated by oxygen atoms and silicon atoms, respectively, in as-implanted glass. After heating at 600 °C, at least two-thirds of the Cu atoms were coordinated by Br atoms without the formation of crystals. The γCuBr crystal was formed after heating to 1100 °C. It was deduced that the coordination structure of Cu and Br atoms depends on defects as well as thermochemical stability and mass transport processes.

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