Abstract
To study the modified surface layer of polycrystalline graphite MPG-8 (produced by NIIGraphite, Moscow, Russia) under high-fluence irradiation by 30 keV N 2 + ions, electron paramagnetic resonance (EPR) spectra of surface layer and the dependence of the ion–electron emission yield γ on the target temperature have been measured. The dependence of γ( T) manifests a step-like behaviour at the temperature T a, which is typical of the radiation-induced phase transition. The EPR analysis shows that below T a, which corresponds to annealing of radiation damage created by ion bombardment, paramagnetic defects are typical of carbon as well as defects connected with bonding of the carbon atom with three 14N nuclei. Above T a, the defects are typical of graphite-like structures. The results for MPG-8 are compared with those for MPG-LT and POCO-AXF-5Q graphites published earlier.
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