Co-60 γ-irradiation effect on linear, nonlinear optical and electrical properties of a semiorganic L-alanine barium nitrate (LABN) crystal

Abstract

ABSTRACTSingle crystals of L-alanine barium nitrate (LABN) were grown by slow evaporation method from aqueous solution under optimized conditions. These crystals were studied by various characterizations tools viz., structural, FTIR analysis, UV absorption, nonlinear optical (NLO), thermal and dielectric studies. The structural study revealed that LABN fit into cubic crystal system with space group . The TGA-DTA study infers that the crystal is stable up to 210 °C. The recorded UV-vis-NIR spectrum shows that, the crystal has wide window and high transmittance. The dielectric parameters as a function of frequency and SHG efficiency by Kurtz powder method of LABN crystal were studied. Further, the crystals were exposed to 1, 3 and 5 Mrad dosage Co-60 gamma radiations and studied the modifications in UV absorption, electrical and nonlinear optical properties. It is observed that the color of the crystal is changed from transparent to yellow and energy gap is decreased upon irradiation. The dc conductivity is increased with increasing in the dosage of gamma radiation, where as SHG efficiency increased for 1 Mrad and then decreased marginally with increasing in the dosage.