Raman spectroscopy of pressure-induced amorphous boron carbide

Journal Article · Mon Mar 27 00:00:00 EST 2006 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.2189826· OSTI ID:20779138

Yan, X Q; Li, W J; Goto, T; Chen, M W ^[1]

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1. Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan)

We report low- and high-temperature Raman spectroscopy of pressure-induced amorphous boron carbide (a-B{sub 4}C). Coarsening of carbon clusters in a-B{sub 4}C was characterized during heating, whereas unusual temperature coefficients of a-B{sub 4}C Raman peak shifts were observed during cooling. These results experimentally evidence that the amorphization of B{sub 4}C is associated with the destruction of the C-B-C chains and a-B{sub 4}C is composed of sp{sup 2} carbon aromatic rings and boron clusters. This disordered structure with relatively weak carbon sp{sup 2} bonds is believed to be responsible for the loss of B{sub 4}C shear strength at high pressures.

• OSTI ID: 20779138
• Journal Information: Applied Physics Letters, Vol. 88, Issue 13; Other Information: DOI: 10.1063/1.2189826; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMORPHOUS STATE
BORON
BORON CARBIDES
CARBON
COOLING
HEATING
RAMAN SPECTRA
RAMAN SPECTROSCOPY
SHEAR PROPERTIES
TEMPERATURE COEFFICIENT