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Title: Elastic properties, sp 3 fraction, and Raman scattering in low and high pressure synthesized diamond-like boron rich carbides

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.4897316· OSTI ID:1420718

Dense BCx phases with high boron concentration are predicted to be metastable, superhard, and conductors or superconductors depending on boron concentration. However, up to this point, diamond-like boron rich carbides BCx (dl-BCx) phases have been thought obtainable only through high pressure and high temperature treatment, necessitating small specimen volume. Here, we use electron energy loss spectroscopy combined with transmission electron microscopy, Raman spectroscopy, surface Brillouin scattering, laser ultrasonics (LU) technique, and analysis of elastic properties to demonstrate that low pressure synthesis (chemical vapor deposition) of BCx phases may also lead to the creation of diamond-like boron rich carbides. The elastic properties of the dl-BCx phases depend on the carbon sp2 versus sp3 content, which decreases with increasing boron concentration, while the boron bonds determine the shape of the Raman spectra of the dl-BCx after high pressure-high temperature treatment. Using the estimation of the density value based on the sp3 fraction, the shear modulus μ of dl-BC4, containing 10% carbon atoms with sp3 bonds, and dl-B3C2, containing 38% carbon atoms with sp3 bonds, were found to be μ = 19.3 GPa and μ = 170 GPa, respectively. The presented experimental data also imply that boron atoms lead to a creation of sp3 bonds during the deposition processes.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-05CH11231; FG02-07ER46408
OSTI ID:
1420718
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Vol. 116 Journal Issue: 13; ISSN 0021-8979
Publisher:
American Institute of PhysicsCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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