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Proposed by D. Sider above, n. Betegh, The Derveni Papyrus Cambridge Cherniss, Harold. Baltimore Cambridge, Mass. Conche, Marcel.
Darcus, Shirley M. Gruppe, Otto. Die griechischen Culte und Mythen in ihren Beziehungen zu den ori- entalischen Religionen. Leipzig repr. Janko, Richard. Kirk, Geoffrey S.
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Nussbaum, Martha C. Osborne, Catherine. Rethinking Early Greek Philosophy. Ithaca, N.
Parker, Robert. London — Polito, Roberto. The Sceptical Road. Lei- den Powell, John E. A Lexicon to Herodotus 2nd ed. Cambridge repr.
Hil- desheim Rohde, Erwin. London repr. Eugene, Ore. Robinson, Thomas M. A text and translation with a commen- tary. Toronto Rusyaeva, Anna S.
Tannery, Paul. Neue Studien zur Geschichte der Begriffe. Gotha repr. Thomson, George. Vinogradov, Jurij G.
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West, Martin L. Early Greek Philosophy and the Orient. Oxford Wilamowitz-Moellendorff, Ulrich von. Der Glaube der Hellenen. Berlin Zeller, Eduard. Die Philosophie der Griechen in ihrer geschichtlichen Entwicklung. Edited by W. Nestle 6th ed.
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Darmstadt The usual assumption has been that interlayer potentials are of the van der Waals type and there have been many attempts to calculate interplanar properties starting fiom Lmard-Jones and Buckingham pair potentials. This work has been reviewed in detail by Kelly [SI who concluded that there is no entirely satisfactory treatment of interlayer forces in graphite. More recent evidence from scanning probe microscopical images of a graphite surface suggest that there may be some n: orbital interaction between planes .
Natural graphites occur widely around the world, although the quality of the ores varies widely. Ticonderoga in the USA has been used as a source of high quality natural graphite flakes for fundamental studies. Principal uses of natural graphites are in the foundry and steel industries and in the refractory and electrical industries, Most synthetic graphites used for engineering applications are granular composites consisting of a filler usually a coke and a binder carbon formed fiom pitch.
The graphitic order in most engineering grade synthetic graphites is less well-developed than in natural graphite; see section 6. Well-graphitised synthetic graphites are produced by hot-pressing pyrolytic graphite HOPG grade ; recently, well-graphitised carbons have been formed by heat-treatment of compacted polyimide films [ Table 2.
In the late s El Goresy and Donnay [ discovered a new form of carbon which they called white carbon or Chaoite in a carbon-rich gneiss in the Ries meteorite crater in Bavaria. Chaoite has an hexagonal crystal structure and it 7 was proposed that it consisted of polyyne or polycumulene carbon chains lying parallel to the hexagonal axis. Lattice parameters for some of these carbyne forms are summarked in Table 3.
Table 3. Crystal structure data for some carbvnes Carbyne Chaoite a-carbyne P-carbyne Structurea hex. The hfferent forms of carbynes were assumed to be polytypes with different numbers of carbon atoms in the chains lying parallel to the hexagonal axis and different packing arrangements of the chains within the crystallite.
Heimann et al  proposed that the sizes of the unit cells were determined by the spacing between kinks in extended carbon chains, Fig. A, A kinked polyyne chain model for linear carbynes after  ; B, cyclo C carbyne . X-ray dimaction peaks were rather broad with coherence lengths as low as 20 nm and this was attributed to rapid quenching.
The density of Carbolite 1. Molecular orbital calculations indicate that cyclo C carbyne should be relatively stable and experimental evidence for cyclocarbynes has been found , Fig. Diederich et al  synthesised a precursor of cyclo C and showed by laser flash heating and time-of flight mass spectrometry that a series of retro Diels-Alder reactions occurred leading to cyclo C- 18 as the predominant fi-agmentation pattern.
Diederich has also presented a fascinating review of possible cyclic all-carbon molecules and other carbon-rich nanometre-sized carbon networks that may be susceptible to synthesis using organic chemical techniques . Despite many publications on carbynes, their existence has not been universally accepted and the literature has been characterised by conflicting claims and counter claims [e. This is particularly true of meteoritic carbynes.
An interesting account of the nature of elemental carbon in interstellar dust including diamond, graphite and carbynes was given by Pillinger . Reitmeijer [3 11 has re-interpreted carbyne diffraction data and has concluded that carbynes could be stratified or mixed layer carbons with variable heteroelement content H,O,N rather than a pure carbon allotrope.
In addition to questions over interpretation of difhction data, there are reservations about the stability of carbynes. Lagow et al  note that the condensation of the compound Li-CaC-Br to form carbon chains is potentially explosive.
There is also the possibility of cross-linking between carbyne chains and the nature of the termination of the carbyne chains is unclear.
The presumption was that these carbynes were stabilised by nitrile and trifluoromethyl end caps. For composites of carbynes and alkali metal fluorides produced by reduction of ,fluoropolymers with alkali metal amalgams, it is argued that the alkali metal matrix suppresses cross-linking of the carbyne chains .
Despite the scepticism in some quarters, a large number of chemical and physical methods have been developed for producing carbynoid materials. These include: dehydropolymerisation of acetylene, dehydrohalogenation of polyvinylidene halides and reductive dehalogenation of poly tetrafluoroethy1ene and related compounds, condensation of carbon vapour produced by various means, e.
At present, no allcarbon carbynoid material has been isolated in large single crystal form and, consequently, full X-ray structural analyses and bulk property measurements have not been performed. An extensive review of carbynes by Russian workers  was published after this Section of the Chapter was completed. The C, molecule, Buckminsterfullerene, was discovered in the mass spectrum of laser-ablated graphite in  and crystals of C, were fitst isolated from soot formed from graphite arc electrodes in .
Although these events are relatively recent, the C60molecule has become one of the most widely-recognised molecular structures in science and in the codiscoverers Curl, Kroto and Smalley were awarded the Nobel prize for chemistry. Part of the appeal of this molecule lies in its beautiful icosahedral symmetry - a truncated icosahedron, or a molecular soccer ball, Fig.
White Phys. Radioactive Pm and Pm John K. Long and M. Pool Phys. Gardner Phys. Search for Long-Lived Nb 94 R. Hein, C. Fowler, and R. McFarland Phys.
McMath, Orren C. Mohler, and A.
Keith Pierce Phys. Lord Phys.
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Matthias Phys. Votruba Phys. McGowan Phys.
Nuclear Reaction Energies D. Van Patter, A. Sperduto, P. Endt, W. Buechner, and H. Enge Phys. Interactions between Nuclear Spins in Molecules N. Ramsey and E. Purcell Phys.
Mulholland and Truman P. Kohman Phys. Ochs and P. Kusch Phys. Condition for Radiation from a Solar Plasma J. Feinstein Phys. Browne, John O. Rasmussen, Joseph P. Surls, and Donald F.
Martin Phys. Quadrupole Radiation in n D Capture N. Austern Phys. Chatterjee and R. Olcott Phys. Bipolar Expansion of Coulombic Potentials. Addenda Robert J.
Buehler and Joseph O. Hirschfelder Phys.Mertz Phys. Skip to main content.
The high volumetric density of strong sp' bonds in diamond leads to a very high value of Young's modulus. Sign up to receive regular email alerts from Physical Review Journals Archive. Trischka, D.