High current density tests were also carried out on monofilaments. Fibres can be subjected to current densities of 200 A/mm2 during several weeks without degradation. Conclusion Although, in the case of intercalated graphite single crystals, conductivities close to that of copper have been obtained, the electrical conductivity of graphite fibres after intercalation fails up to now to equal aluminium or copper values. Nevertheless, with the constant progress made in the production of graphite fibres and with an appropriate choice of intercalates, better figures are expected in the near future. Moreover, owing to their stability, their low density and their mechanical properties, they have good prospects for power transmission, particularly in solar power satellites. ACKNOWLEDGEMENTS This work was supported by Electricite de France (EDF). We are grateful to M. Endo and L. Singer, for their donation of fibre samples. We also thank J. Fourre (Le Carbone Lorraine) for some heat-treatments. REFERENCES [1] Delhaes, P. & Carmona, F. (1981) Chemistry and Physics of Carbon, (hereafter referred to as Carbon), 17, 89. [2] Bright, A.A. & Singer, L.S. (1979) Carbon, 17, 59. [3] Kwizera, P., Dresselhaus, M.S., Uhlmann, D.R., Perkins, J.S. & Desper, C.R. (1982) Carbon, 20, 387. [4] Koyama, T., Endo, M. & Hishiyama, Y. (1974) Japanese Journal of Applied Physics, 13, 1933. [5] Guigon, M., Oberlin, A. & Desarmot, G. (1984) Fibre Science & Technology, 20, 177. [6] Chieu, T.C., Timp, G., Dresselhaus, M.S. & Endo, M. (1983) Physical Review B, 27, 3686; Endo, M., Chieu, T.C. Timp, G., Dresselhaus, M.S. & Elman B.S. (1983)Physical Review B, 28, 6982; Dresselhaus, M.S. (1984) Journal de Chimie Physique, 81, 739. [7] Bagga, G.R. (1985) Thesis, University of Grenoble; Bagga, G.R., Touzain P. & Bonnetain, L. (1984), Conference Internationale sur les Carbones, Bordeaux, p. 292. [8] Kwizera, P., Dresselhaus, M.S., Uhlmann, D.R., Perkins, J.S. & Desper, C.S. (1982) Carbon, 20, 387. [9] Oshima, H., Woolam, J. A. & Yavrouian, A. (1982) Journal of Applied Physics, 53, 9220; Oshima, H. Natarajan, V., Woolam, J.A., Yavrouian, A., Haugland, E.J., & Tsuzuku, T. (1984) Japanese Journal of Applied Physics, 23, 40; Natarajan, V. & Woolam, J.A. (1983) Synthetic Metals, 8, 291. [10] Hazrati, A., Olk, C.H., Eklund, P.C. & Beetz, C.P. (1983) 16th Conference on Carbon, Extended Abstracts, p. 278. [11] Dominguez, D.D. & Murday, J.S. (1983) 16th Conference on Carbon, Extended Abstracts, p. 276. [12] Dziemanowicz, T.S. & Forsman, W.C. (1983) Synthetic Metals, 8, 297. [13] Manini, C., McRae, E., Mareche, J.F. & Herold, A. (1985) Revue de Chimie Minerale, 22, 161. [14] McRae, E. & Mareche, J.F. (1985) Journal of Physics C, 18, 1627.
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