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Rajarajan G.,Selvam Educational Institutions | Marimuthu D.,SSRM | Senthikumar J.,Vidya Vikas Higher Secondary School | Jegatheesan A.,Paavaai Group of Institutions | Ravi B.,King College
Rasayan Journal of Chemistry | Year: 2014

Single crystals of thiourea potassium iodide (abbreviated as TPI) K [CS (NH2)2] I were successfully grown by slow evaporation method at room temperature from its aqueous solution. The harvested crystals were of average dimensions 13×3×3 mm3. Powder X-ray Diffraction studies were carried out and the lattice parameters of the grown crystals have been evaluated. Surface morphology of the TPI was studied by scanning electron microscope (SEM). The dielectric response of the sample was studied in the frequency region 100 Hz to 10 kHz. From the second harmonic generation (SHG) efficiency test it is evident that the sample has the efficiency 1.1 times that of potassium dihydrogen phosphate (KDP). © 2014 RASĀYAN. All rights reserved. Source


Jegatheesan A.,Paavaai Group of Institutions | Rajarajan G.,Selvam Educational Institutions
International Journal of ChemTech Research | Year: 2015

Single crystals of the Glycine Fumarate (GFA) were from the aqueous solution by slow evaporation method at room temperature. Single crystal X ray diffraction analysis reveals that the crystal belongs to orthorhombic crystal system. Optical transmission studies show that the crystal is transparent in the entire visible region with cut off wave length 252 nm .The optical band gap is found to be 3.872 eV. Mechanical hardness studies carried out to find the Hardness number of the grown crystal and it is increase with increase in applied load. Mayer index number was calculated for the grown up crystal and found that the materials belongs to the soft material category. Dielectric constant and the dielectric loss of material were calculated by using dielectric analysis at the room temperature. Further, electrical properties, such as Plasma energy, Penn energy, Fermi energy and electronic polarizability of the growth crystals have been predicated. The optical second harmonic generation conversion efficiency of GFA was determined by Kuntz powder technique and it shows that the material is the potential candidate for the NLO applications and its efficiency found to be 0.2 times that of KDP. © 2015, Sphinx Knowledge House. All rights reserved. Source


Senthilvelan N.,Arignar Anna Government Arts College | Rajarajan G.,Selvam Educational Institutions | Sivakumar S.,Salem College
International Journal of ChemTech Research | Year: 2014

Single crystal of Cobalt sulfamate (CSM) has been grown successfully by slow evaporation method. XRD, FTIR and SEM analysis were done to characterize the grown sample structurally. Optical property of the sample was studied by recording UV –Vis spectra and optical band gap was determined. Thermal stability of the CSM crystal was analyzed by TG/DSA analysis. Electrical measurements were done on the grown sample for various frequencies ranging from50-5MHz within three different temperatures. The optical and electrical properties of the crystal indicate the suitability of this crystal for photonic device fabrication. The results are reported herein. © 2014 Sphinx Knowledge House. All rights reserved. Source


Jegatheesan A.,Paavaai Group of Institutions | Aroulmoji V.,Mahendra Engineering College | Rajarajan G.,Selvam Educational Institutions
Asian Journal of Chemistry | Year: 2014

The studies on the growth and characterization of a new semi-organic non-linear optical crystal, L-asparagine potassium dihydrogen phosphate have been successfully carried out by slow evaporation technique using deionized water as a solvent. The grown crystal is characterized by powder X-ray diffraction analysis and FT-IR analysis. The results of X-ray diffraction analysis showed that it possess orthogonal structure having lattice parameters a = 5.582 A, b = 9.812 A and c = 11.796 A, a = b = g = 90° and V = 514 A3. The fourier transform infrared spectroscopy of L-asparagine potassium dihydrogen phosphate crystal were recorded between wave-number 4000 to 400 cm-1 showed very weak bands appearing around 1232 and 1147 cm-1 are due to P-O-H stretching and bending. The observed broad intense band in 3385-3119 cm-1 region is assigned to NH stretch of NH2 vibration of L-asparagine potassium dihydrogen phosphate molecule. The CH2 vibration of the amino acid shows its peak at 2945 cm-1. The combination band observed at 2149 cm-1 is due to asymmetric NH3 + vibration at 1643 cm-1 and NH2 + tensional oscillation at 512 cm-1 and optical transmission spectral analysis. The lower cut off wavelength of L-asparagine potassium dihydrogen phosphate crystal occurs at 198 nm and it reveals that the material has good optical transparency in the entire visible region. The results of hardness test showed that the presence of dopant has enhanced the mechanical strength of the L-asparagine potassium dihydrogen phosphate crystals and the second harmonic generation of L-asparagine potassium dihydrogen phosphate crystals was tested using Kurtz and Perry method also showed good results. Source


Ravi B.,King College | Rajarajan G.,Selvam Educational Institutions
Oriental Journal of Chemistry | Year: 2014

Single crystal of Thallium doped cesium Iodide -Scintillator crystal was grown using vertical Bridgeman technique. The grown crystal was included for cutting and polishing for the characterization purpose and this crystal was studied by optical transmission properties, photo luminescence and thermally luminescence characteristics. Gamma-ray detectors were fabricated using the grown crystal that showed good linearity and nearly 7.6% resolution at 662 keV. Source

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