skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Bonding, elastic and vibrational properties in low and high pressure synthesized diamond-like BCx phases

Abstract

Recent studies demonstrate that low pressure chemical vapor deposition at 950 K leads to the synthesis of diamond-like boron carbides with high concentrations of boron (0.66 < x < 4) in which the sp 2 fraction depends on the boron concentration [1]. This indicates that the graphitic BC3 (g-BC3) phases obtained by chemical vapor deposition materials are mixtures of diamond-like and graphitic BCx phases. This finding allows us to revise the interpretation of the x-ray diffraction (XRD) patterns of the g-BC3 phases discussed previously [2, 3]. To support the new interpretation, we conducted a laser heating experiment of the g-BC3 phase. We found that after laser heating at 1100 K and 25 GPa in a diamond anvil cell (DAC) almost all graphitic layers of the g-BC3 transform into a cubic structure. The XRD pattern of the cubic BC3 phase (c-BC3) can be indexed with a cubic unit cell a = 3.619 (0.165) Å. Measurements of the equation of state of the g-BC3 phase demonstrated that boron atoms were incorporated into the graphitic B-C network. The linear compressibility along the c axis can be characterized by the value of the linear modulus Bc = 29.2 ± 1.8 GPa. Linear fitting ofmore » the experimental data for the a/a o parameter as a function of pressure gives us the value of the linear elastic modulus along the a axes: Ba = 800 ± 75 GPa.« less

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
DOE - BASIC ENERGY SCIENCESNSFDOE-NNSA
OSTI Identifier:
1409110
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Physics. Conference Series; Journal Volume: 950; Journal Issue: 11, 2017; Conference: Madrid, Spain
Country of Publication:
United States
Language:
ENGLISH
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Zinin, P., Liu, X. R., Jia, R., Sharma, S. K., Ming, L. C., Kutuza, I., and Troyan, I. Bonding, elastic and vibrational properties in low and high pressure synthesized diamond-like BCx phases. United States: N. p., 2017. Web. doi:10.1088/1742-6596/950/4/042050.
Zinin, P., Liu, X. R., Jia, R., Sharma, S. K., Ming, L. C., Kutuza, I., & Troyan, I. Bonding, elastic and vibrational properties in low and high pressure synthesized diamond-like BCx phases. United States. doi:10.1088/1742-6596/950/4/042050.
Zinin, P., Liu, X. R., Jia, R., Sharma, S. K., Ming, L. C., Kutuza, I., and Troyan, I. Sun . "Bonding, elastic and vibrational properties in low and high pressure synthesized diamond-like BCx phases". United States. doi:10.1088/1742-6596/950/4/042050.
@article{osti_1409110,
title = {Bonding, elastic and vibrational properties in low and high pressure synthesized diamond-like BCx phases},
author = {Zinin, P. and Liu, X. R. and Jia, R. and Sharma, S. K. and Ming, L. C. and Kutuza, I. and Troyan, I.},
abstractNote = {Recent studies demonstrate that low pressure chemical vapor deposition at 950 K leads to the synthesis of diamond-like boron carbides with high concentrations of boron (0.66 < x < 4) in which the sp 2 fraction depends on the boron concentration [1]. This indicates that the graphitic BC3 (g-BC3) phases obtained by chemical vapor deposition materials are mixtures of diamond-like and graphitic BCx phases. This finding allows us to revise the interpretation of the x-ray diffraction (XRD) patterns of the g-BC3 phases discussed previously [2, 3]. To support the new interpretation, we conducted a laser heating experiment of the g-BC3 phase. We found that after laser heating at 1100 K and 25 GPa in a diamond anvil cell (DAC) almost all graphitic layers of the g-BC3 transform into a cubic structure. The XRD pattern of the cubic BC3 phase (c-BC3) can be indexed with a cubic unit cell a = 3.619 (0.165) Å. Measurements of the equation of state of the g-BC3 phase demonstrated that boron atoms were incorporated into the graphitic B-C network. The linear compressibility along the c axis can be characterized by the value of the linear modulus Bc = 29.2 ± 1.8 GPa. Linear fitting of the experimental data for the a/a o parameter as a function of pressure gives us the value of the linear elastic modulus along the a axes: Ba = 800 ± 75 GPa.},
doi = {10.1088/1742-6596/950/4/042050},
journal = {Journal of Physics. Conference Series},
number = 11, 2017,
volume = 950,
place = {United States},
year = {Sun Oct 01 00:00:00 EDT 2017},
month = {Sun Oct 01 00:00:00 EDT 2017}
}