High-pressure EXAFS investigations of Ge-bearing compounds
ORAL
Abstract
The Ge K edge of amorphous GeO$_{2}$ was studied by Extended X-ray Absorption Fine Structure (EXAFS) upon increasing and decreasing pressure cycles up to 44 GPa [1]. Up to 13 GPa, the local structure was well described by a 4-fold coordination model. A disordered region formed by a mixture of 4- and 5-coordinated Ge polyhedra was observed in the intermediate pressure range between 13 and 30 GPa, and above 30 GPa the structural transition to the maximum coordination was complete. Preliminary EXAFS results obtained on crystalline Ge and on GeH$_{4}$ compounds will be also presented. \\[4pt] [1] M. Baldini, G. Aquilanti, H-k. Mao, W. Yang, G. Shen, S. Pascarelli, W. L. Mao, \textbf{Phys. Rev. B} \emph{in press}
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