Raman spectra of ground natural graphite

✍ Scribed by M. Nakamizo; H. Honda; M. Inagaki

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 430 KB
• Volume: 16
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(78)90043-x

✦ Synopsis

Structural changes in Ceylon natural graphite with grinding were studied by &man spectroscopy along with X-ray diffraction. The natural graphite shows a single Kaman band at 1580cm-', but the ground graphite samples exhibit two Raman bands at 1360 and 1620 cm-' in addition to the 1580 cm-' graphite band. The 1360 cm-' band increases in intensity with increasing grinding time, and becomes much stronger than the 1580 cm-' band after 200~hr grinding. Raman results are compared with structural parameters such as effective Debye parameter and CO spacing obtained from X-ray diffraction measurements, and discussed in terms of structural defects introduced into the crystal lattice of natural graphite. A linear rela~onship was obtained for the ground graphite when the relative intensity of the 1340 cm-' band is plotted as a function of effective Debye parameter. The slope of the linear plot is diKerent for the ground graphite from that for the graphitized cokes, indicating a difference in the type of structural defects involved.