HIGH-PRESSURE HIGH-TEMPERATURE XAFS INVESTIGATION ON HGTE

X-ray absorption measurements at tile L-3 edge of Hg is solid and liqu id Hg/Te have been performed under high-temperature and high-pressure up to 1000 K and 3 GPa using a large volume Paris-Edinburgh press. EXA FS spectra have been analyzed with GNXAS approach. The pressure depend encies of tile nearest neighbor distance and the bond variance at room temperature as well as their variation with temperature at 0.6 GPa ha ve been obtained, The temperature dependence of the bond variance has been fitted to the Einstein model and is consistent to the decrease or the bulk modulus with increasing temperature, which has recently been shown to occur by an x-ray diffraction study.