Crystal Research and Technology
Cryst. Res. Technol. 42, 595 (2007) - Abstract -

Synthesis, spectral and thermal properties of non-linear optical crystal ZnMg(SCN)4

R. Bharathi Kannan, A. Chandramohan*, J. Chandra Sekar, and M. A. Kandhaswamy*

Department of Physics, Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore – 641 020, Tamil Nadu, India
*Department of Chemistry, Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore – 641 020, Tamil Nadu, India

Keywords single crystals, solution growth, thermal studies, infrared spectra, non-linear optical material
PACS 42.70.Mp, 61.10.Nz, 65.40.-b, 81.10.Dn
DOI 10.1002/crat.200610869

Single crystals of zinc magnesium tetra thiocyanate [ZnMg(SCN)4], a bimetallic thiocyanate complex, were grown by slow evaporation solution growth technique at room temperature. The bright, transparent and colourless crystals have well defined faces. The grown crystals were characterized through elemental analysis, powder X-ray diffraction (XRD), thermogravimetric (TG) and differential thermal analysis (DTA), differential scanning calorimetric analysis (DSC), Fourier Transform Infra red (FTIR) and Optical studies. The elemental analysis confirms the stoichiometry of the synthesized crystals. The compound crystallizes under monoclinic structure with lattice parameters a = 10.055 Å, b = 7.44 Å, c = 6.00 Å and β = 90.113°. The TGA indicates 25 % weight loss at 205°C from which the decomposition pattern is formulated. The DSC study indicates that the crystal undergoes only first order phase transitions. The FTIR spectrum indicates among others the presence of metal-nitrogen and metal-sulphur bonds thus confirming the formation of the complex. The second harmonic-generation (SHG) was confirmed by the emission of green radiation using Nd: YAG laser.




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