Abstract
High resolution Ge K-EXAFS and XANES spectra were measured at 80 K and 300 K for trigonal and tetragonal GeO2 crystals, and GeO2 glass by using synchrotron radiation. By comparing the χ(k) and ¦F(r)¦ curves of these samples, it was found that the averaged short-range structure of GeO2 glass resembles that of trigonal GeO2 crystals. By the parameter fitting method, the Ge-O and Ge-Ge distances of the GeO2 glass were determined to be 1.74 and 3.15 A respectively, which are close to those of trigonal GeO2 crystals. However, an apparent Debye-Waller type factor for Ge-Ge pairs of GeO2 glass is larger than that of trigonal GeO2 crystals. The fine structures observed in high resolution near-edge spectra indicate that the linkage of GeO4 tetrahedra in the GeO2 glass is quite similar to that in trigonal GeO2 crystals.
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