Proprietes electroniques et magnetiques de fibres de carbone evolution sous irradiation neutronique

Techniques developed for the measurement of the electrical resistivity and the diamagnetic anisotropy of carbon fibres, in the temperature range 77–300°K are described. Two types of fibres were studied: the Rigilor AC fibres treated at 1100°C and the Rigilor AG fibres treated at 2500°C. The measurements of electrical resistivity performed on single fibres show the presence of some correlation between this property and the cross-sectional area of the fibre. Measurements of diamagnetic susceptibility carried out on bundles of fibres demonstrate a large anisotropy of the fibres. The influence of small neutron irradiation doses on these properties has been studied at room temperature.