Early crystallization of amorphous selenium under high pressure studied by synchrotron XRD method

Author:

Yuan Shuhua,Wang LuhongORCID,Liu Fuyang,Bass Jay D,Li Yingzhe,Ginsberg Paul A,Zhang Dongzhou,Prakapenka Vitali B,Tkachev Sergey,Liu HaozheORCID

Abstract

Abstract The amorphous selenium (a-Se) was studied via x-ray diffraction (XRD) under pressures ranging from ambient pressure up to 30 GPa at room temperature to study its high-pressure behavior. Two compressional experiments on a-Se samples, with and without heat treatment, respectively, were conducted. Contrary to the previous reports that a-Se crystallized abruptly at around 12 GPa, in this work we report an early partially crystallized state at 4.9 GPa before completing the crystallization at around 9.5 GPa based on in-situ high pressure XRD measurements on the a-Se with 70 °C heat treatment. In comparison, crystallization pressure on another a-Se sample without thermal treatment history was observed to be 12.7 GPa, consistent with the previously reported crystallization pressure. Thus, it is proposed in this work that prior heat treatment of a-Se can result in an earlier crystallization under high pressure, which helps to understand the possible mechanism caused by the previous controversial reports on pressure induced crystallization behavior in a-Se.

Funder

National Natural Science Foundation of China

U.S. Department of Energy (DOE) Office of Science User Facility

Department of Energy - GeoSciences

National Science Foundation – Earth Sciences

Publisher

IOP Publishing

Subject

Condensed Matter Physics,General Materials Science

Reference42 articles.

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