title: Growth, thermal, dielectric and mechanical properties of L-phenylalanine-benzoic acid: a nonlinear optical single crystal.
abstract: An efficient amino acid family nonlinear optical single crystal L-phenylalanine-benzoic acid (LPB) was conveniently grown by slow evaporation technique at room temperature. The crystal system and the lattice parameters were analyzed by single crystal X-ray diffraction studies. The grown crystal has excellent transmission in the entire visible region and its lower cut-off wavelength was found to be 248 nm. The SHG efficiency of the grown crystal was found to be 1.6 times higher than that of KDP crystal. The Laser damage threshold value of LPB has been found to be 6.5 GW/cm(2). The sample was thermally stable up to 134°C. Microhardness, dielectric and AC/DC conductivity measurements were made along (001) plane and reported for the first time. Microhardness studies revealed that the sample belongs to hard nature. Frequency dependent dielectric constant was measured for different temperatures and found maximum dielectric constant of 14 for 363 K. Photoconductivity studies of LPB divulged its negative photoconducting nature.
authors.affiliation: Department of Physics, Arignar Anna Government Arts College, Cheyyar 604 407, India.
authors.forename: S
authors.initials: S
authors.lastname: Tamilselvan
authors.forename: M
authors.initials: M
authors.lastname: Vimalan
authors.forename: I Vetha
authors.initials: IV
authors.lastname: Potheher
authors.forename: S
authors.initials: S
authors.lastname: Rajasekar
authors.forename: R
authors.initials: R
authors.lastname: Jeyasekaran
authors.forename: M Antony
authors.initials: MA
authors.lastname: Arockiaraj
authors.forename: J
authors.initials: J
authors.lastname: Madhavan
mesh_terms: D019817:Benzoic Acid / Q000737:chemistry*; D003460:Crystallization; D018360:Crystallography, X-Ray; D004553:Electric Conductivity; D006244:Hardness; D007834:Lasers; D010649:Phenylalanine / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry
chemical_list: D010649:Phenylalanine; D019817:Benzoic Acid
keywords: Nonlinear optical material; Optical material; Photoconductivity; Solution growth; Thermal analysis; X-ray diffraction