Nanometric Amorphization of Oxide Materials under Dense Electronic Excitation: Swift Heavy Ion Irradiations

摘要

The state of at of nanometric amorphization of oxide materials induced by dense electronic excitation following the slowing down of swift heavy ion will be presented. Energy deposition will be briefly described : nuclear collisions regime and electronic collisions regime. the importance of the Structure of the material to drive the amorphization in the nuclear collisions regime is emphasised. After a description of experimental observations and quantifications of the nanometric amorphization, it will be shown that the electronic collisions regime is more efficient to induce the phase transformations. A transient thermal description called the thermal spike model, is able to describe quantitatively the amorphization following the dense electronic excitation. It appears that the band gap energy is one of the important parameters driving the matter transformations.