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Author Kumar, Rajesh ♦ Ali, S. Asad ♦ De, Udayan ♦ Avasthi, D. K. ♦ Prasad, Rajendra
Source IACS Kolkata
Content type Text
Publisher Indian Association for the Cultivation of Science
File Format PDF
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics
Subject Keyword Makrofol-KG polycarbonate ♦ Silicon and Neon Ions ♦ Ion Beam Modification ♦ Dielectric Constant ♦ Dielectric Loss
Abstract The passage of heavy ions in a track detector polymeric material produces lattice deformations.These deformations may be in the form of latent tracks or may vanish by self annealing in time. Heavy ionirradiation produces modifications in polymers in their relevant electrical, chemical and optical properties in theform of rearrangement of bonding, cross-linking, chain scission, formation of carbon rich clusters and changesin dielectric properties etc. Modification depends on the ion, its energy and fluence and the polymeric material. Inthe present work, a study of the dielectric response of pristine and heavy ion irradiated Makrofol-KG polycarbonateis carried out. 40 μm thick Makrofol-KG polycarbonate films were irradiated to various fluences with Si8+ ions of100 MeV energy from Pelletron at Inter University Accelerator Centre (IUAC), New Delhi and Ne6+ ions of 145 MeVfrom Variable Energy Cyclotron Centre, Kolkata. On irradiation with heavy ions dielectric constant ( ) decreaseswith frequency where increases with fluence for both the ions. Variation of loss factor (tan ) with frequencyfor pristine and irradiated with Si ions reveals that tan increases as the frequency increases. Tan alsoincreases with fluence. While Ne irradiated samples tan shows slight variation with frequency as well as withfluence. Tan has positive values indicating the dominance of inductive behavior.
Education Level UG and PG
Learning Resource Type Article
Journal Indian J Phys
Volume Number 83
Issue Number 7
Page Count 6
Starting Page 963
Ending Page 968