Abstract

Abstract Tin oxide nanometric powders have been irradiated with several swift heavy ions (Ar, Cd, Ta, Pb and U) and observed by transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM). Except for Ar ions, cylindrical tracks are visible at low fluences. The mean track radius is all the more important since the electronic stopping power S e is high. Furthermore, the high S e irradiating ions (Pb, Ta and U) create cylindrical holes while, in the case of Cdion irradiations, the track cores remain crystallized with a difference of contrast from the surrounding crystal. In this case, simulations of HREM images allow us to assert that an amount of matter is lost in Cd track cores. Assuming that the observed latent tracks result from a thermal process, the thermal spike model gives a good description of the observed effects in the high-S e regime. Cylindrical holes correspond to a local area where the maximum temperature reached along the ion path exceeds the boiling point. Concerning Cd-ion tracks, the temperature reached is not high enough to lead to vaporization. A sputtering effect on surface may explain the fact that some matter remains crystallized in the track cores. Moreover, a grain size effect during irradiation has been evidenced by TEM observations and confirmed by thermal spike calculations.

Full Text
Paper version not known

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.