Keywords :
Experimental/ high-pressure effects; liquid structure; liquid-liquid transformations; selenium; X-ray diffraction/ local order; high-pressure metallic phase; liquid selenium; phase transition; metallic phase; x-ray diffraction; metallic liquid; large-volume Paris-Edinburgh cell; coordination number; 3 to 4.1 GPa; 20 to 1650 degC; Se/ A6250 High-pressure and shock-wave effects in solids and liquids A6470J Liquid-liquid transitions A6125M Structure of liquid metals and liquid alloys/ pressure 3.0E+09 to 4.1E+09 Pa; temperature 2.93E+02 to 1.92E+03 K/ Se/el
Abstract :
[en] Liquid selenium undergoes a phase transition towards a metallic phase when sufficient pressure is applied. We performed an x-ray diffraction experiment at the 1D30 beamline of the ESRF at the wavelength of 0.149 Aring to investigate the local order of the metallic liquid. The diffraction pattern of liquid Se has been recorded with the large-volume Paris-Edinburgh cell between (20degC, 3 GPa) and (1650degC, 4.1 GPa). The local order of the metallic liquid selenium is found to be close to that of liquid tellurium. In particular, the coordination number Z increases with temperature from 2.6 to 3.0
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