Low temperature anomalies in specific heat of soft carbons

✍ Scribed by S Mozowski; A.S Vagh

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 254 KB
• Volume: 13
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(75)90080-9

✦ Synopsis

Abstracts magnetothermal oscillations have been observed in chamber with a focused continuous CO, laser beam. pyrolytic graphite. Four de-Haas van Alphen frequencies Temperature was measured by pyrometers with < O.Olwere detected. The results point towards a correlation set reaction time. A pressure range of 0~0016-6~0 atm was between one of the minority frequencies and the covered, and the carbon solid-liquid-gas triple point was difference of the two majority frequencies. located at 3780 + 30°K at 0.19 + 0.02 atm.

12. Change of electronic properties of neutron irradiated pyrocarbon under thermal annealing A. S. Kotosonov (V/O "Soyuzuglerod," Mowcow, 111123, U.S.S.R.). No short abstract submitted. tThis work reflects research supported under U.S. Air Force Space and Missile Systems Organization (SAMSO) Contract No. FO4701-74-C-0075 and the Atomic Energy Commission. 13. Model of structure for interstitial carbon in graphite J. Conard and H. Estrade (C.R.S.O.C.I.-CNRS, 4.5045 Orleans, France). This paper discusses interstitial carbon grafted 1.2 A above the center of aromatic ring. For this point defect an electronic structure is proposed which uses overlap of sp,, px, py, orbitals of carbon and II electrons of aromatic ring. It is shown that graphitic situation increases stabilization. The carbon is negatively charged giving induced ionic bond with opposite aromatic plane. This model would explain creation of a varying gap, Hall anomaly and other properties of graphitizable carbons. 17. Macroscopic model for the interlayer thermal expansion of a series of pyrocarbons G. Fug, P. Delhaes and H. Gasparoux