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1 2009

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Non-stoichiometric boron carbide synthesized in moderate temperature conditions

Sun G., Li Y. W., Hu Q. K., Wu Q. H., Yu D. L.

Materials Science Poland

2009

Vol. 27, No. 4/1

1033--1039

Non-stoichiometric boron carbide was successfully synthesized through a chemical synthetic route by using tribromide and carbon tetrachloride as reactants and metal sodium as co-reductant at 700 °C. The synthesized sample was characterized by X-ray powder diffraction, transmission selected area electron diffraction, electronic energy loss spectra (EELS) and scanning electron microscopy. The results of the analysis revealed that the synthesized boron carbide crystals have rhombohedral structure and equiaxial morphology. Results of the EELS analysis indicate that the compositions of the synthesized boron carbide are not uniform, the carbon content can range from 9 at. % to 11 at. %.