title: Optical, structural, thermal and dielectric spectroscopy characterizations of seeded melt grown 2-hydroxy biphenyl single crystal.
abstract: Organic single crystal of 2-hydroxy biphenyl (2-HB) was grown by top seeded melt growth method. Scanning electron microscopy studies has been carried out on the surface of the grown crystals to investigate the nature of growth and defects. The crystalline perfection and lattice parameters of 2-HB has been determined by single crystal XRD analysis and it belongs to orthorhombic crystal system with space group Fdd2. The functional groups and molecular associations were confirmed by FT-IR. The optical characteristics such as cut-off and transmittance were carried out using UV-Vis-NIR spectra. Absence of absorption in the region between 320 and 1100 nm makes the grown crystal desirable to optical applications. Thermal stability of grown crystals was characterized by thermogravimetric (TGA), differential thermal analysis (DTA) and differential scanning calorimetric (DSC) analyses. Broadband dielectric studies reveals that dielectric constant of grown crystal is low. The resistivity of grown crystal was studied by impedance analysis. The second harmonic generation intensity of 3.8 mJ was studied. The grown crystal belongs to soft material studied by hardness test.
authors.affiliation: Department of Physics, SSN College of Engineering, Tamil Nadu 603 110, India.
authors.forename: S
authors.initials: S
authors.lastname: Sadhasivam
authors.affiliation: Department of Physics, SSN College of Engineering, Tamil Nadu 603 110, India. Electronic address: rajeshnp@ssn.edu.in.
authors.forename: Narayana Perumal
authors.initials: NP
authors.lastname: Rajesh
mesh_terms: D001713:Biphenyl Compounds / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D003460:Crystallization; D058266:Dielectric Spectroscopy; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D008968:Molecular Conformation; D055095:Optics and Photonics; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D019265:Spectroscopy, Near-Infrared; D013696:Temperature; D013818:Thermogravimetry; D014961:X-Ray Diffraction
chemical_list: D001713:Biphenyl Compounds; C004369:2-phenylphenol
keywords: Dielectric properties; FT-IR; Melt growth; Organic optical crystals; Thermal analysis