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Evaluation of structural, optical, and dielectric characterization of adipic acid crystals grown in aqueous solution of L-alanine M. S. Dileep1, G. K. Prashanth2, and S. R. Boselin Prabhu3,* 1

Department of Physics, Sir M. Visvesvaraya Institute of Technology, Bengaluru- 562157, Affiliated to Visvesvaraya Technological University, Belagavi 590018, India 2 Department of Chemistry, Sir M. Visvesvaraya Institute of Technology, Bengaluru- 562157, Affiliated to Visvesvaraya Technological University, Belagavi 590018, India 3 Department of ECE, Surya Engineering College, Mettukadai 638 107, India

Received: 13 October 2020

ABSTRACT

Accepted: 2 November 2020

In this paper, adipic acid crystals were grown using slow evaporation method in aqueous solution of L-alanine at room temperature. X-ray diffraction investigation shows that the crystal belongs to P21/n space group. EDAX study confirms the occurrence of elements in the crystal. The crystal is thermally stable up to 124 °C. Further, the grown crystals were exposed to Co-60 gamma radiations with different doses of 1 Mrad, 3 Mrad, and 5 Mrad at normal room temperature. After gamma irradiation, a small change in the intensity and a slight shift in the Powder X-Ray Diffraction (PXRD) peaks were seen. UV–visible analysis reveals an increase in reflectance after gamma irradiation. Increase in dielectric constant, dielectric loss, and AC conductivity was observed by dielectric studies. Second Harmonic Generation (SHG) efficiency of the crystal is 0.42 times that of the standard Potassium Dihydrogen Phosphate (KDP) crystal and is increased moderately up to the gamma irradiation dosage of 3 Mrad.

Published online: 15 November 2020

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Springer Science+Business

Media, LLC, part of Springer Nature 2020

1 Introduction Modern world depends on the development of science in many areas. The growth of nonlinear optical crystals has a considerable impact on optical communication, laser technology, and digital data storage technology [1]. Organic crystals are chemically pure and exhibit good optical nonlinearity and low scattering densities than inorganic crystals which have

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https://doi.org/10.1007/s10854-020-04816-3

elevated melting point and high mechanical properties. The nonlinear response of the organic crystal is due to the asymmetric distribution of charge in the pelectron system. Amino acids show nonlinear optical (NLO) activity as all amino acids except glycine have chiral carbon atom, a proton-donating carboxyl group with a proton-receiving amino group, and crystallize in centrosymmetric space groups [2].

22894 L-alanine is the smallest and naturally occurring amino acid existing as zwitterions where amino group is protonated and carboxyl group is dissociated [3, 4]. If L-alanine is mixed with different organic and inorganic molecules to form new materials, it is expected to obtain superior NLO properties. It was reported that L-alanine admixed with perchloric acid shows second- and third-order nonlinear optical susc