Dielectric Studies on Swift Heavy Ions and Electron Irradiated Organic Single Crystal

摘要

Single crystals of 1-(4-methylphenyl)-3-(4,N,N-dimethylamino phenyl)-2-propen-1-one were irradiated with 72MeV swift heavy ions of C-12 with different fluencies 5 X 10~(11), 1X10~(12) and electrons with energy 8MeV for a dose of 2.25kGy. The changes in the dielectric properties of these crystals have been studied. The study shows that the dielectric constant increases first and then decreases with the increase of fluence. This variation has been discussed and possible explanations are given. The variation of dielectric loss and the ac conductivity indicates that there is some structural modification within the crystal due to irradiation. The electron irradiation induced ionic polarizibility within the crystal along the electron path, which is reflected in increase in dielectric constant and hence the conductivity.