Abstract
Extended X-ray absorption fine structure (EXAFS) measurements were performed on crystalline and liquid Se at 2.5 GPa. A decrease of amplitude of the EXAFS oscillation for liquid Se was observed at temperatures >1050 K. The decrease was larger than that expected from the normal thermal effect and it indicates that the two-fold chain structure in liquid Se is modified at temperatures >1050 K. The change occurs near the boundary of a semiconductor-to-metal transition. This coincidence confirms that the transition is accompanied by a structural change. EXAFS for crystalline and liquid Te at 6 GPa were also measured. The peak amplitude in radial distribution function for liquid Te at 6 GPa is smaller than that observed at the similar temperature and atmospheric pressure. We suggest that the decrease is due to the modification of the covalent bonds.
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