Grain boundary premelting in crystalline benzene as studied by proton N.M.R.

The phenomenon of premelting has been investigated by proton n.m.r. in polycrystalline benzene of various purity. Our results suggest that premelting initiates at grain boundaries. The exact nature of the molten domains near the standard melting point is not yet clear but is presumably analogous to what is obtained in the surface melting experiments, i.e. a «strongly correlated interface liquid» Le phenomene de prefusion dans le benzene polycristallin de purete variable a ete etudie par r.m.n. du proton. Nos resultats suggerent que la prefusion debute aux joints de grains. La nature exacte des domaines fondus n'est pas encore tres claire mais il semble que l'on observe un liquide d'interface tres correle, comme les auteurs qui etudient la fusion de surface