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Optical Absorption and X-Ray Diffraction Studies of Sulfur Under High Pressure |
| CHEN Liang-chen;WANG Li-jun |
| Institute of Physics, Chinese Academy of Sciences, Beijing 100080 |
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| Cite this article: |
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CHEN Liang-chen, WANG Li-jun 1999 Chin. Phys. Lett. 16 675-676 |
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Abstract In situ high pressure optical absorption measurements of sulfur have been carried out by using DAC device with a TASCO V-550 UV-VIS spectrophotometer at pressures up to 41.6GPa. The curves of absorption edge vs pressure were obtained, in which there are two turning points at about 5 and 12GPa, corresponding to two changes of colour in the optical observation: one is from yellow to red and the other from red to black at 5-6.5 and 10-12GPa, respectively. The absorption edge reaches above 800nm when the pressure is increased to 23GPa. The structure and phase transitions have also been investigated by using in situ high pressure energy-dispersive x-ray diffraction with synchrotron radiation at pressures up to 33.7GPa. No structure phase transition occurs at 5-6 GPa, but there is a new high-pressure phase, caused probably by the reorientation or ordering of S8.
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| Keywords:
62.50.+p
64.70.-p
78.20.-e
61.10.-i
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Published: 01 September 1999
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