Chinese Physics C > 2005, Vol. 29 > Issue(S1): 120-122

Synchrotron Radiation Diffraction of Amorphous Selenium under High Pressure

National Laboratory of Superhard Materials, Jilin University, Changchun 130012, China2 Institute of High Energy Physics, Chinese Academy of Sciences,Beijing 100049, China

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Abstract：
High-pressure in situ energy dispersive X-ray diffraction (EDXRD) experiments on amorphous selenium(a-Se) have been carried out using a synchrotron X-ray source and a diamond anvil cell (DAC) up to 74.3GPa at room temperature. The pressure-induced crystallization of a-Se has been found at the pressures between 10GPa and 11GPa, and the crystal structure is confirmed to be the mixture of hexagonal phase and a new high pressure metallic phase. It is noticeable that the new phase is still stable up to 42GPa, and completely transformed to the orthorhombic phase after 42GPa. Two structure phase transitions at about 30GPa and 60GPa have also been observed, which agree very well with Mao et al and Akahama et al, respectively, whose work were starting from the material of hexagonal selenium.

References

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YANG Kai-Feng, CUI Qi-Liang, MA Yan-Mei, ZHANG Jian, LI Xue-Fei, SHEN Long-Hai, ZHOU Qiang, LUO Cong-Ju, LIU Jing and ZOU Guang-Tian. Synchrotron Radiation Diffraction of Amorphous Selenium under High Pressure[J]. Chinese Physics C, 2005, 29(S1): 120-122.

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Received: 2005-10-31
Revised: 1900-01-01

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通讯作者:陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Synchrotron Radiation Diffraction of Amorphous Selenium under High Pressure

Corresponding author:ZHOU Qiang,

National Laboratory of Superhard Materials, Jilin University, Changchun 130012, China2 Institute of High Energy Physics, Chinese Academy of Sciences,Beijing 100049, China

Received Date:2005-10-31

Accepted Date:1900-01-01

Available Online:2005-01-02

Abstract:High-pressure in situ energy dispersive X-ray diffraction (EDXRD) experiments on amorphous selenium(a-Se) have been carried out using a synchrotron X-ray source and a diamond anvil cell (DAC) up to 74.3GPa at room temperature. The pressure-induced crystallization of a-Se has been found at the pressures between 10GPa and 11GPa, and the crystal structure is confirmed to be the mixture of hexagonal phase and a new high pressure metallic phase. It is noticeable that the new phase is still stable up to 42GPa, and completely transformed to the orthorhombic phase after 42GPa. Two structure phase transitions at about 30GPa and 60GPa have also been observed, which agree very well with Mao et al and Akahama et al, respectively, whose work were starting from the material of hexagonal selenium.

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Synchrotron Radiation Diffraction of Amorphous Selenium under High Pressure

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