CORRELATION OF MULTIPLE-SCATTERING FEATURES IN XANES SPECTRA OF AL AND SI K-EDGES TO THE AL-O-SI BOND-ANGLE IN ALUMINOSILICATE SODALITES - AN EMPIRICAL-STUDY
M. Froba et al., CORRELATION OF MULTIPLE-SCATTERING FEATURES IN XANES SPECTRA OF AL AND SI K-EDGES TO THE AL-O-SI BOND-ANGLE IN ALUMINOSILICATE SODALITES - AN EMPIRICAL-STUDY, Physica. B, Condensed matter, 209(1-4), 1995, pp. 65-67
Using a YB66 monochromator X-ray absorption measurements were carried
out at the Al K and Si K absorption edges of a series of aluminosilica
te sodalites. The Al-O-Si bridging angle of the selected sodalites var
ies from 138 degrees to 148 degrees and the structure of the XANES wit
h its different multiple scattering (MS) features shows a strong angul
ar dependence. Increasing the angle results in a decrease of the MS in
tensities. This dependence is especially pronounced at the Al K edges
which contain a couple of separated well-resolved peaks whereas the co
rresponding features at the Si K edges are smeared out due to a strong
overlapping of the peaks.