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Growth and Characterization of Bis(thiourea) Antimony Tribromide: A Reliable Non-Linear Optical Crystal

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Abstract

Bis(thiourea) antimony tribromide (BTAB) single crystals of semi organic non-linear optical (NLO) crystal category have been effectively grown and harvested by the technique of slow solvent evaporation. The important nucleation kinetic parameter values have been deduced for the title crystal and the agreement between the experimental and theoretical values of interfacial surface energy has been established. The orthorhombic structure and Cmc21 space group have been identified with the aid of single crystal X-ray diffraction studies. To validate the stoichiometry and the purity of the crystals, elemental analysis has been carried out. The UV transmittance spectrum has been employed to deduce the significant optical constant and oscillator parameter values. In the region of absorption edge, Urbach tail energy has been determined to ascertain the crystalline perfection of BTAB. The etching studies inferred the step growth pattern of the crystal. The phase matchable SHG efficiency of BTAB has been tested by Kurtz–Perry technique. The negative photoconductivity and low birefringence values have been revealed by photoconductivity study and birefringence study respectively. Dielectric and ac conductivity studies have helped in calculating the activation energy values of the electrical process. Important solid state parameters such as valence electron plasma energy, Penn gap, Fermi energy and polarisability have been calculated for the BTAB crystal. To assess the mechanical stability of the crystal Vicker’s micro hardness analysis has been performed and important mechanical parameters have been elucidated.

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Acknowledgements

The authors express their thanks to B.S. Abdur Rahman University, Chennai; PG and research Department of Chemistry, Dr. Ambedkar Govt. Arts College, Vyasarpadi; SAIF-Indian Institute of Technology, Chennai; St. Joseph’s College of Engineering, Chennai; University of Madras, Guindy campus; IISc, Bengaluru; St. Joseph College, Trichy for extending their lab facilities towards the research studies.

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  1. Research and Development Centre, Bharathiar University, Coimbatore, 641046, India

    N. R. Rajagopalan

  2. Department of Chemistry, St. Joseph’s College of Engineering, Chennai, 600119, India

    N. R. Rajagopalan

  3. Department of Chemistry, Dr. Ambedkar Govt. Arts College, Chennai, 600039, India

    P. Krishnamoorthy

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Rajagopalan, N.R., Krishnamoorthy, P. Growth and Characterization of Bis(thiourea) Antimony Tribromide: A Reliable Non-Linear Optical Crystal. J Inorg Organomet Polym 27, 296–312 (2017). https://doi.org/10.1007/s10904-016-0472-x

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