“…Experimental investigations of the Bordoni peak in silver have been carried out by Bordoni et a1 (1960), Okuda (1963a,b), Mongy et al (1965), Mecs and Nowick (1968), Besson et al (1972) and Chountas et a1 (1972). Most of the work was performed on polycrystalline material, for which the authors estimate values of the activation energy for the Bordoni peak ranging from 0.09 5 0.015 eV (Chountas et al 1972) to 0.130 f 0.008 eV (Besson et a1 1972), very similar to that for polycrystalline copper.…”