The effects of sulfur and other impurities on carbon-graphite transitions

✍ Scribed by V.A. Tyumentsev; E.A. Belenkov; G.P. Shveikin; S.A. Podkopaev

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 815 KB
• Volume: 36
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/s0008-6223(97)00143-7

✦ Synopsis

The transition to graphite of carbons containing sulfur and the effects of added iron and chromium on this process have been studied using X-ray diffraction analysis and electron microscopy. It was found that after heat treatment in the temaerature interval 1300-1600°C carbons containing at least 1.5 mass% of sulfur, or 0.3 mass% of sulfur and 1.5 mass% of added Cr,O, become heterogeneous; they consist of an ultradisperse matrix and of large (> 100 nm) and sufficiently perfect (Ad/dw,-0.002) regions of coherent scattering with interlayer spacing dooz that corresponds to the graphite-crystal structure. When disperse iron is added, the amount of the graphite phase in this temperature interval decreases by a factor of 2.