-
Author(s):
K. Kamada, H. Kinoshita and H. Takahashi
-
Title:
Anomalous Heat Evolution of Deuteron Implanted Al on Electron Bombardment
Date of publication:
June 1995
-
Key words:
deuteron implantation, electron bombardment, melting
-
Abstract:
Anomalous heat evolution, which is presumed to continue for about 2x10^-11 seconds, was observed in deuteron implanted Al foils on 175 keV electron bombardment. Local regions with linear dimension of more than 100nm each showed simultaneous transformation from single crystalline to polycrystalline structure in roughly one minutes on the electron bombardment, indicating the temperature rise up to more than melting point of Al from room temperature. The amount of energy evolved was typically 160MeV for each transformed region. The transformation was never observed in proton implanted Al foils. Microstructures in the subsurface layer of the implanted Al, investigated by the collaboration of ERD and TEM, were presented for numerical discussions of the experimental results. Possible causes of the surface melting such as heating effect of the electron beam, size effect of the melting point, difference of the implanted depth profiles between the hydrogen and deuterium, and possible chemical reactions due to the electron bombardment in D_2 collections were investigated, and the conclusion was inevitable that some kind of nuclear reactions which takes place in the D_2 collections is responsible for the melting.
-
|
