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Title: Pressure-Induced Crystallization and Phase Transformation of Amorphous Selenium: Raman Spectroscopy and X-ray Diffraction Studies

Abstract

High-pressure Raman spectroscopy studies have been carried out on amorphous Se (a-Se) at room temperature in a diamond anvil cell with an 830 nm exciting line. Raman evidence for the pressure-induced crystallization of a-Se and the coexistence of the unknown high-pressure phase with the hexagonal phase is presented for the first time. Further experimental proof of high-pressure angle-dispersive x-ray diffraction studies for a-Se indicates that the unknown high-pressure phase is also a mixture phase of the tetragonal I41/acd and Se IV structure. Our Raman and x-ray diffraction results suggest that hexagonal Se I undergoes a direct transition to triclinic Se III at about 19 GPa, which is in good agreement with the theoretical prediction.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
959715
Report Number(s):
BNL-82701-2009-JA
Journal ID: ISSN 0953-8984; JCOMEL; TRN: US201016%%859
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Physics: Condensed Matter; Journal Volume: 19
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTALLIZATION; DIAMONDS; FORECASTING; MIXTURES; PHASE TRANSFORMATIONS; RAMAN SPECTROSCOPY; SELENIUM; X-RAY DIFFRACTION; national synchrotron light source

Citation Formats

Yang,K., Cui, Q., Hou, Y., Liu, B., Zhou, Q., Hu, J., Mao, H., and Zou, G. Pressure-Induced Crystallization and Phase Transformation of Amorphous Selenium: Raman Spectroscopy and X-ray Diffraction Studies. United States: N. p., 2007. Web. doi:10.1088/0953-8984/19/42/425220.
Yang,K., Cui, Q., Hou, Y., Liu, B., Zhou, Q., Hu, J., Mao, H., & Zou, G. Pressure-Induced Crystallization and Phase Transformation of Amorphous Selenium: Raman Spectroscopy and X-ray Diffraction Studies. United States. doi:10.1088/0953-8984/19/42/425220.
Yang,K., Cui, Q., Hou, Y., Liu, B., Zhou, Q., Hu, J., Mao, H., and Zou, G. Mon . "Pressure-Induced Crystallization and Phase Transformation of Amorphous Selenium: Raman Spectroscopy and X-ray Diffraction Studies". United States. doi:10.1088/0953-8984/19/42/425220.
@article{osti_959715,
title = {Pressure-Induced Crystallization and Phase Transformation of Amorphous Selenium: Raman Spectroscopy and X-ray Diffraction Studies},
author = {Yang,K. and Cui, Q. and Hou, Y. and Liu, B. and Zhou, Q. and Hu, J. and Mao, H. and Zou, G.},
abstractNote = {High-pressure Raman spectroscopy studies have been carried out on amorphous Se (a-Se) at room temperature in a diamond anvil cell with an 830 nm exciting line. Raman evidence for the pressure-induced crystallization of a-Se and the coexistence of the unknown high-pressure phase with the hexagonal phase is presented for the first time. Further experimental proof of high-pressure angle-dispersive x-ray diffraction studies for a-Se indicates that the unknown high-pressure phase is also a mixture phase of the tetragonal I41/acd and Se IV structure. Our Raman and x-ray diffraction results suggest that hexagonal Se I undergoes a direct transition to triclinic Se III at about 19 GPa, which is in good agreement with the theoretical prediction.},
doi = {10.1088/0953-8984/19/42/425220},
journal = {Journal of Physics: Condensed Matter},
number = ,
volume = 19,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}