STUDIES OF NA-SEGREGATION AT NI ALPHA-QUARTZ INTERFACES/

Ni/alpha-quartz bilayers were irradiated at 77 K with 200 keV Na+ ions at a fluence of 5 x 10(16) ions/cm(2) and annealed in hydrogen up to 883 K. The Na-migration at the Ni/alpha-quartz interface and towards t he Ni-surface, the hydrogen storage in the irradiated region, and the Ni/alpha-quartz interface broadening due to Na implantation and decora tion were investigated via Rutherford Backscattering Spectrometry (RES ) and Resonant Nuclear Reaction Analysis (RNRA). We demonstrate that a fter a one hour-annealing at 833 K a large fraction of the implanted N a has been trapped at the Ni/alpha-quartz interface from where it is r eleased at 883 K. The results are discussed and compared with our find ings in Na-irradiated metals and silicon compounds.