Physical properties of a magnetically-oriented carbonaceous mesophase

✍ Scribed by P. Delhaes; J.C. Rouillon; G. Fug; L.S. Singer

• Publisher: Elsevier Science
• Year: 1979
• Tongue: English
• Weight: 586 KB
• Volume: 17
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(79)90030-7

✦ Synopsis

Diamagnetic susceptibility, electron spin resonance, and specific heat measurements have been made on a magnetically-oriented mesophase pitch. The diamagnetic anisotropy (xl -~11) was found to be -0.69 x lo-" emu CGS g-' and the average susceptibility i = (2x11 t x1)/3 = -0.73 x lo-" emu CGS g-l. ESR measurements of the g-factor and linewidth confirmed the anistropic behavior and indicated free radical concentrations of -1.2 x 10'9g-'. The low-temperature specific heat results showed evidence of an anomalous linear term. A consideration of the magnitude of the susceptibility and atomic C/H ratio suggests that the molecules consist of relatively small aromatic regions connected by aliphatic and aryl bridges.