G. , Anandha babu and P. , Ramasamy and N. , Vijayan and D. , Kanjilal and K. , Asokan (2008) Effect of 50 MeV Li3+ ion irradiation on electrical, optical and mechanical properties of 4,4 '-dimethylbenzophenone. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 266 (23). pp. 5032-5036. ISSN 0168-583X

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Abstract

4,4′-Dimethylbenzophenone (DMBP) single crystals were irradiated at room temperature and at liquid nitrogen temperature with 50 MeV Li3+ ions at fluences 1 × 1012 and 1 × 1013 ions/cm2. The dielectric constant and dielectric loss as a function of frequency of the applied ac field in the range from 20 Hz to 1 MHz and at temperatures ranging from 313 to 353 K were analyzed. The dielectric constant decreases with increase in frequency for all the temperatures. The dielectric constant and dielectric loss increase with fluence. Optical absorption was measured at different conditions. UV–Vis studies reveal the decrease in bandgap. The unirradiated as well as irradiated crystals were characterized by photoluminescence. Ion-induced changes were also studied with respect to their mechanical response using the Vicker’s microhardness technique and parameters including fracture toughness, brittleness index and yield strength are calculated.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/S Elsevier B.V.
Subjects:	Instruments/ Instrumentation Nuclear Science Technology Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	23 Jul 2013 08:54
Last Modified:	23 Jul 2013 08:54
URI:	http://npl.csircentral.net/id/eprint/982

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