Abstract
High-pressure modifications in glassy ${\text{GeS}}_{2}$ have been investigated up to 45 GPa using the diamond anvil cell through x-ray absorption fine structure (XAFS) spectroscopy and x-ray diffraction (XRD). The gradual increase in the Ge-S distance of about $0.1\text{ }\text{\AA{}}$ between 15 and 25 GPa evidenced by XAFS is interpreted as a signature of a coordination increase around Ge. The negative shift of the germanium $K$ absorption edge position is connected to the progressive metallization of the glass. XRD measurements reveal the amorphous-amorphous nature of the structural transformation. The first sharp diffraction peak loses intensity and shifts toward higher $Q$ values in the first few gigapascal, reflecting changes in the intermediate-range order prior to the local coordination increase. The observed changes are reversible after pressure release with strong hysteresis.
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