Laboratoire Charles Coulomb UMR 5221 CNRS/UM2 (L2C)


Accueil > La Recherche > Axes & Equipes > Matière Molle & Verres > Equipe : Physique des Verres > Thème : Mécanismes d’endommagement des verres à l’échelle nanométrique

Ionic migration at the crack tip

par sinfo - publié le

Involved researchers : M. Ciccotti, M. George, G. Pallares
(Collaboration C. Marlière, F. Célarié)

The slow advance of a crack in soda-silicate glasses was studied at nanometer scale by in-situ and real-time atomic force microscopy (AFM) in a well-controlled atmosphere. An enhanced diffusion of sodium ions in the stress-gradient field at the sub-micrometric vicinity of the crack tip was revealed through several effects : growth of nodules in AFM height images, changes in the AFM tip–sample energy dissipation. The nodules patterns revealed a dewetting phenomenon evidenced by ‘breath figures’.

AFM topographic image of ion migration near a crack tip - © L2C

Recent publication : J. Non-Cryst. Solids 353, pp. 51-68 (2007)