Nanostructure Evolution of Expanded Graphite during High-Energy Ball-Milling

Abstract:

Expanded graphite (EG) was ball-milled in a high-energy planetary-type mill under an air atmosphere. The X-ray diffraction patterns of the products show that during the milling process (up to 100 h), the out-of-plane (L_c) and in-plane (L_a) crystallite sizes decrease gradually from 15.4 to 11.3 nm and 24.1 to 15.5 nm, respectively. The value of L_c/L_a, which is used to estimate the shape of the crystallites, increases gradually from 0.64 to 0.73. Compared with most of natural graphite, this L_c decrease degree of EG is far lower. This increased value of L_c/L_a indicates that the crystallites of the milled EG become thicker and steeper, which is contrary to the case for natural graphite.

• Periodical: Applied Mechanics and Materials (Volumes 80-81)
• Pages: 229-232
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.80-81.229
• Online since: July 2011
• Authors: Wen Yan Duan
• Keywords: Graphite, Nanostructured Materials, X-Ray Diffraction (XRD)

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