Creator: Follstaedt, David M.; Norman, A. K.; Doyle, B. L. & McDaniel, Floyd Del. (Floyd Delbert), 1942-
Description: This article discusses strain fields around high-energy ion tracks in α-quartz. Transmission electron microscopy has been used to image the tracks of high-energy math (374 MeV) and math (241 MeV) ions incident in a nonchanneling direction through a prethinned specimen of hexagonal α-quartz (SiO2). These ions have high electronic stopping powers in quartz, 24 and 19 keV/nm, respectively, which are sufficient to produce a disordered latent track. When the tracks are imaged with diffraction contrast using several different reciprocal lattice vectors, they exhibit a radial strain extending outward from their disordered centerline approximately 16 nm into the crystalline surroundings. The images are consistent with a radial strain field with cylindrical symmetry around the amorphous track, like that found in models developed to account for the lateral expansion of amorphous SiO2 films produced by irradiation with high-energy ions. These findings provide an experimental basis for increased confidence in such modeling.
Contributing Partner: UNT College of Arts and Sciences