title: Growth, spectral, thermal, dielectric, mechanical, linear and nonlinear optical, birefringence, laser damage threshold studies of semi-organic crystal: dibrucinium sulfate heptahydrate.
abstract: Dibrucinium sulfate heptahydrate (DBSH), a semi-organic nonlinear optical material, has been synthesized and single crystals were grown from water-ethanol solution at room temperature up to dimensions of 10×7×2 mm(3). The unit cell parameters were determined from single crystal and powder X-ray diffraction studies. The structural perfection of the grown crystal has been analyzed by high-resolution X-ray diffraction (HRXRD) study. FTIR and Raman studies were performed to identify the functional groups present in the title compound. The activation energy (E), entropy (ΔS), enthalpy (ΔH) and Gibbs free energy (ΔG), of the thermal decomposition reaction have been derived from thermo gravimetric (TGA) and differential thermal (DTA) analysis curves, using Coats-Redfern method. The variation of dielectric properties of the grown crystal with respect to frequency has been investigated at different temperatures. Microhardness measurements revealed the mechanical strength of grown crystal. The optical parameters, the optical band gap E(g) and width of localized states Eu were determined using the transmittance data in the spectral range 200-800 nm. The relative second harmonic efficiency of the compound is found to be 1.4 times greater than that of KDP. Birefringence and Laser damage threshold studies were carried out for the grown crystal.
authors.affiliation: Department of Physics, Presidency College, Chennai 600 005, India.
authors.forename: P
authors.initials: P
authors.lastname: Krishnan
authors.forename: K
authors.initials: K
authors.lastname: Gayathri
authors.forename: G
authors.initials: G
authors.lastname: Bhagavannarayana
authors.forename: V
authors.initials: V
authors.lastname: Jayaramakrishnan
authors.forename: S
authors.initials: S
authors.lastname: Gunasekaran
authors.forename: G
authors.initials: G
authors.lastname: Anbalagan
mesh_terms: D001718:Birefringence; D003460:Crystallization; D018360:Crystallography, X-Ray; D006244:Hardness; D007834:Lasers; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D013431:Sulfates / Q000737:chemistry*; D013818:Thermogravimetry
chemical_list: D013431:Sulfates