Growth and characterization of NLO based L-arginine maleate dihydrate single crystal.
Single crystals of L-arginine maleate dihydrate (LAMD) were successfully grown from aqueous solution by solvent evaporation technique. As-grown crystals were analyzed by different instrumentation techniques such as X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectra and UV-vis near infrared (NIR) transmittance spectra. Thermal behavior has been studied with TGA/DTA analyses. The optical second harmonic generation (SHG) conversion efficiency of LAMD was determined using Kurtz powder technique and found to be 1.5 times that of KDP.
Synthesis and Growth of Triaquaglycinesulfatozinc(II), [Zn(SO4)(C2H5NO2)(H2O)3], a New Semiorganic Nonlinear Optical Crystal
Triaquaglycinesulfatozinc(II) (ZGS), a new semiorganic nonlinear optical material with molecular formula [Zn(SO4)(C2H5NO2)(H2O)3], has been synthesized at ambient temperature. Spectral, thermal, and optical techniques have been employed to characterize the new materials. Bulk single crystals of ZGS with a size of 4.2 × 2.7 × 1.2 cm3 have been grown with a solution at pH 5.0 by the slow cooling method. The powder X-ray diffraction pattern of the grown ZGS has been indexed. Functional groups present in the sample were identified by FTIR spectral analysis. Thermal stability of ZGS was determined using TGA/DTA curves. The Kurtz powder second harmonic generation test shows that the compound is a potential candidate for optical second harmonic generation. The optical transparency range and the lower cutoff UV transmission were identified from the UV−vis spectrum of ZGS.
Magnetic properties of Lu2Fe17 crystals
Abstract We present the results of crystal structure and magnetization studies of three single crystals grown from melts of different nominal compositions in the vicinity of the Lu2Fe17 stoichiometry. The ferromagnetic state of the crystals is strongly dependent on the real sample composition and the local atomic ordering. A drastic difference is observed in the behaviour of the ferro–antiferromagnetic transition, even in crystals for which almost identical composition and crystal parameters were determined by microprobe and X-ray analysis.