Abstract
Single crystal growth of γ-glycine has been grown by solution growth technique. The lattice parameters and crystal system of the grown crystals were confirmed by single crystal X-ray diffraction analysis. The functional groups present in the grown crystal were identified by FT-IR spectral analysis. The optical property of the γ-glycine crystal is studied by UV-Visible spectrum. Optical constants such as band gap, refractive index, extinction coefficient and electrical susceptibility were calculated to analyze the optical property from UV-Visible spectrum. The thermal analyses revealed good thermal stability of the material thus proving its suitability for NLO applications. The second harmonic generation (SHG) test has been confirmed by the Kurtz powder test. The dielectric studies of γ-glycine crystal were studied in the different frequency and different temperatures. Photoconductivity measurements were carried out in order to reveal the negative photoconductivity of the γ-glycine crystal. Key words: Nonlinear optical (NLO), single x-ray diffraction, UV-visible spectrum, second-harmonic generation (SHG), dielectric constant, dielectric loss.  
Highlights
Single crystal growth has a prominent role in the present era of rapid scientific and technical advancement, whereas the application of crystals has unbounded limits
From the single crystal X-ray diffraction analysis, we found that the lattice parameters were calculated to be a = 7.023 Å, b = 7.024 Å, c = 5.412 Å
The lattice parameters of the grown crystals were determined by single crystal XRD
Summary
Single crystal growth has a prominent role in the present era of rapid scientific and technical advancement, whereas the application of crystals has unbounded limits. The importance of amino acids in NLO applications is due to the fact that all amino acids have a chiral symmetry and crystallize in noncentro-symmetric space groups. Complexes of glycine with inorganic acid /salts are promising materials for optical second harmonic generation as they tend to combine advantages of the organic aminoacid with that of the inorganic salt. These materials exhibit promising structural background in view of their zwitterionic, protonated forms and structural stabilization with hydrogen bonding. The grown crystals were characterized by single crystal X-ray analysis, FTIR, UV spectral analysis, thermal, dielectric, SHG, and photoconductivity measurements The results of these studies have been discussed in this paper in detail.
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