Centrosymmetric crystal structure and third order nonlinear optical properties of [2(C10H20O5) NH4] [Cd (SCN)3]: CCTC single crystal for optical application

• Published in: Optical and quantum electronics 2023-11, Vol.55 (12), Article 1105
• Main Authors: Ramkumar, S., Malliga, P.
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Computer Communication Networks; Crystal growth; Crystal lattices; Crystal structure; Cut off wavelength; Diamond pyramid hardness; Dielectric loss; Differential thermal analysis; Diffraction patterns; Electrical Engineering; Functional groups; Lasers; Lattice parameters; Nonlinear optics; Optical Devices; Optical properties; Optics; Photonics; Physics; Physics and Astronomy; Room temperature; Single crystals; Thiocyanates
• ISSN: 0306-8919; 1572-817X
• DOI: 10.1007/s11082-023-05432-1

A novel Bis-15-crown-5-ether cadmium tri-thiocyanate non-linear optical single crystal was synthesized by the slow evaporation method. The single crystal X-ray diffraction pattern was utilized to determine the crystal structure, lattice parameters and symmetry. It reveals the grown title compound is monoclinic structure and underwent a centrosymmetric space group of P2 1/n . The prepared sample functional groups and optical properties were analyzed by FTIR, micro Raman and UV–Vis-NIR spectrum. The sample optical cut-off wavelength was found in the deep UV region and the band gap was calculated from Tauc’s relation. Additionally, crystal growth mechanisms such as surface morphology, reverse growth rate and elemental composition were observed from the high-resolution-scanning electron microscope, etching and energy dispersive spectroscopy studies. Moreover, thermal and mechanical stability were examined by TG–DTA, Vickers hardness studies. At room temperature, the as-grown crystal dielectric constant (ε r ) and dielectric loss (tanδ) were studied as a function of temperature and the results are discussed. The third-order non-linear optical properties were obtained from Z-scan studies under 633 nm excitation.