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

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

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Article number264003
JournalJournal of Physics Condensed Matter
Volume35
Issue number26
DOIs
StatePublished - Jul 5 2023

Keywords

  • amorphous state
  • crystallization
  • heat treatment
  • in-situ high pressure XRD

ASJC Scopus subject areas

  • Condensed Matter Physics
  • General Materials Science

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