A boron-doped glassy carbon was fabricated by chemical vapor deposition from a gaseous CH4/BCl3 mixture. It was characterized by X-ray diffraction, Raman spectroscopy, scanning, and transmission electron microscopy. Results show that the deposited carbon is characteristic of a glass-like carbon but with boron carbide nanocrystals around 20 nm in diameter uniformly distributed in its matrix. In contrast to the conventional non-graphitizable glassy carbon, the product behaved similarly to a graphitizable carbon on high-temperature treatment because of the strong catalytic graphitization effect of the boron. The glass carbon was transformed into lamellar carbon structures, probably by a dissolution-precipitation mechanism.
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[xu li; wu jun-feng; bai shuo] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;wu, jf (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;lixu@imr.ac.cn; jfwu@imr.ac.cn
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