Studies on growth and characterization of swift heavy ion irradiated 2 amino 5 nitropyridine family of crystals

Abstract

Swift heavy ion (SHI) irradiation is now considered as an advanced newlinetechnique to modify structural, optical, optoelectronic, thermal, mechanical, newlinenonlinear optical (NLO) properties of crystals through intense electronic energy newlinedeposition. Tremendous energy (few tends of M eV to few G eV) deposition to newlinethe material can produce various changes in the material. Using SHI beam newlineirradiation one can create new defects as well as anneal out pre- existing defects newlinein materials. SHI is also used to produce materials with novel properties, which newlinecannot be generated by any other means. newlineIn this present work, newer variety of 2-amino-5-nitropyridine family newlineNLO crystalline derivatives were grown using slow evaporation method and also newlinenew crystalline structures namely 2-amino-5-nitropyridinium hydrogen oxalate newline(2A5NPHO) and 2-amino-5-nitropyridinium sulfamate (2A5NPS) solved. Bulk newlinecrystals of 2-amino-5-nitropyridinium hydrogen oxalate (2A5NPHO), 2-amino-5- newlinenitropyridinium chloride (2A5NPCl) and 2-amino-5-nitropyridinium sulfamate newline(2A5NPS) were grown using Assembled Temperature Reduction (ATR) method newlineand bulk crystal of 2-amino-5-nitropyridinium dihydrogen phosphate (2A5NPDP) newlinewas grown using Sankaranarayanan- Ramasamy (SR) method. Though newlinesemiorganic nonlinear optical (NLO) single crystal combined the advantages of newlineboth organic and inorganic, the efficiency of second harmonic generation (SHG) newlineand other physico- chemical properties are to be modified further for enhanced newlinedevice fabrication. Modifications in the structural, optical, electrical, thermal, mechanical and newlinenonlinear optical (NLO) efficiency of irradiated crystals with virgin (pristine) newlineNLO single crystals were investigated. It was understood from the X-ray newlinediffraction that lattice was deformed due to the formation of defects and lattice newlinedeformation was taken place only in a small area. It was noticed in the optical newlineproperties that absorption was increases and energy band gap was changed due to newlinethe intermediated energy levels created by SHI.