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Enhancement of second harmonic generation, optical and dielectric properties in l ‐asparagine monohydrate single crystals due to an improvement in crystalline perfection by annealing
Author(s) -
Shakir Mohd.,
Kushawaha S. K.,
Maurya K. K.,
Kumar Sumeet,
Wahab M. A.,
Bhagavannarayana G.
Publication year - 2010
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889810008745
Subject(s) - materials science , annealing (glass) , dielectric , diffraction , aqueous solution , single crystal , second harmonic generation , crystallography , crystal (programming language) , evaporation , optics , chemistry , optoelectronics , composite material , organic chemistry , laser , programming language , physics , computer science , thermodynamics
Single crystals of the relatively new nonlinear optical material l ‐asparagine monohydrate have been successfully grown by the slow evaporation solution growth technique at room temperature in aqueous solution. The crystal system of the title material has been confirmed by powder X‐ray diffraction. The crystalline perfection of the as‐grown and annealed crystals has been evaluated by high‐resolution X‐ray diffraction. The as‐grown single crystals (particularly when their size is large) were found to contain internal structural grain boundaries, and the crystalline perfection of these crystals was found to be improved substantially by annealing at low temperatures. The crystalline perfection and the measured physical properties were found to be correlated such that the second harmonic generation efficiency, optical transparency, fluorescence and dielectric properties are enhanced as the crystal quality improves.