Abstract
EXAFS spectra are measured for ZnCl 2 and ZnBr 2 glasses by a laboratory-type X-ray absorption spectrometer. Structural parameters are obtained by a curve fitting method using theoretical phase shifts and backscattering amplitudes. Further, a ‘fine adjustment’ technique proposed by Teo et al. is used to improve the accuracy of the bond distance determination. The results for ZnCl 2 glass are in agreement with the previous study of Desa et al. For ZnBr 2 glass the Zn-Br bond distance was determined to be 2.44 Å and the four-fold coordination which has been predicted by Raman spectroscopic studies on ZnBr 2-based glasses was confirmed.
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