title: Synthesis, crystal growth and physical characterizations of organic nonlinear optical crystal: Ammonium hydrogen L-malate.
abstract: An organic nonlinear optical crystal ammonium hydrogen l-malate (AHM) has been synthesized. Single crystals of AHM have successfully been grown by the slow evaporation solution method. Optically clear single crystals having dimensions up to 23×9×4mm(3) have been grown. Single crystal X-ray diffraction study confirms that the AHM crystallizes in orthorhombic crystal system with space group P212121. The powder X-ray diffraction pattern of the grown crystal has been recorded. FT-IR spectrum was recorded to identify the various functional groups of AHM. The UV-vis-NIR transmission was analyzed for grown crystal. Thermal analysis was performed to find out thermal stability of the compound. Vickers microhardness measurements were carried and also work hardening coefficient has been found. The crystalline perfection of the grown crystal has been analyzed by HRXRD measurements. The second harmonic efficiency of AHM was found to be 1.2 times that of KDP.
authors.affiliation: Centre for Crystal Growth, SSN College of Engineering, Kalavakkam, Chennai 603 110, India.
authors.forename: K
authors.initials: K
authors.lastname: Boopathi
authors.affiliation: Centre for Crystal Growth, SSN College of Engineering, Kalavakkam, Chennai 603 110, India. Electronic address: ramasamyp@ssn.edu.in.
authors.forename: P
authors.initials: P
authors.lastname: Ramasamy
mesh_terms: D064751:Ammonium Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D003460:Crystallization; D018360:Crystallography, X-Ray; D008293:Malates / Q000138:chemical synthesis / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D064751:Ammonium Compounds; D008293:Malates; C030298:malic acid
keywords: Chemical synthesis; Crystal growth; Optical materials; Organic crystal; X-ray diffraction