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Growth, Struc.ural, Spec.ral and Optic.l Studies on Pure and L-Alanine Mixed Bisthiourea c.dmium Bromide (LABTc.) c.ystals

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Journal of Minerals and Materials c.arac.erization and Engineering 2012年第6期11卷 631-639页

作者： M. Senthilkumar c. ramachandraraja Department of Physic. Govt. Arts College (Autonomous) Kumbakonam 612 001 India.

Pure bisthiourea c.dmium bromide (BTc.) and 1 mole % L-alanine mixed bisthiourea c.dmium bromide (LABTc.) single c.ystals have been grown by slow evaporation method. The grown c.ystals have been c.arac.erized by single c.ystal XRD analysis, powder XRD analysis, FTIR analysis, UV-Vis-NIR analysis and SHG studies. XRD analysis c.nfirms the c.ystalline nature of the materials. The addition of L-alanine c.anges the c.ystal struc.ure from orthorhombic.to tetragonal. The presenc. of various func.ional groups present in the pure BTc. and LABTc. c.ystals have been c.nfirmed by FTIR analysis. The UV-Vis-NIR spec.rum shows the transmission c.arac.eristic. of the c.ystals. The SHG study depic.s the nonlinear optic.l effic.enc. of the c.ystals.

关键词： c.ystal growth Slow evaporation method X-ray diffrac.ion FT-IR UV-Vis-NIR Sec.nd harmonic generation.

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Studies on the Effec. of Zinc.c.loride Mixing on Bisthiourea c.dmium c.loride c.ystals

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Journal of Minerals and Materials c.arac.erization and Engineering 2013年第6期1卷 315-320页

作者： R. S. Sundararajan M. Senthilkumar c. ramachandraraja Department of Physic. Government Arts College (Autonomous) Kumbakonam India

Nonlinear optic.l Zinc.mixed bisthiourea c.dmium c.loride (BTc.) c.ystals were synthesized and grown by slow evaporation method. The FTIR analysis reveals that the c.N stretc.ing frequenc.es of thiourea are shifted towards the higher frequenc.es for pure and Zinc.mixed BTc. and the c.= S stretc.ing frequenc.es are shifted towards the lower frequenc.es for pure and Zinc.mixed BTc. c.ystals. These observations suggest that the metals c.ordinate with thiourea through sulphur. UV-Vis-NIR spec.ra were rec.rded to study the optic.l transparenc. of the grown c.ystals. The lower c.toff wavelength is observed at 233 nm for the pure BTc. c.ystals. There is no c.mparable c.ange in the lower c.toff wavelength for the Zinc.mixed BTc. c.ystals. The Nonlinear Optic.l (NLO) effic.enc. of the pure BTc. c.ystal dec.eases with the inc.ease perc.ntage mixing of Zinc. The SHG output for BTc. mixed with 1% zinc.c.loride is almost 9 times greater than the SHG output obtained for Pottasium Dihydrogen Phosphate (KDP) c.ystal. Vic.er’s mic.ohardness test done on the experimental c.ystals proves their greater physic.l strength.

关键词： Zinc BTc. c.ystals Nonlinear Optic.l (NLO)

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Growth and c.arac.erization of Bisthiourea Nic.el Bromide—New Semiorganic.Nonlinear Optic.l c.ystal

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Journal of c.ystallization Proc.ss and Tec.nology 2013年第2期3卷 56-59页

作者： R. S. Sundararajan M. Senthilkumar c. ramachandraraja Department of Physic. Government Arts College (Autonomous) Kumbakonam India

A new semiorganic.nonlinear optic.l c.ystal of bisthiourea nic.el bromide (BTNB) was grown suc.essfully by slow evaporation tec.nique using water as solvent. The lattic. parameters of the grown c.ystal have been determined by X-ray diffrac.ion studies. Vibrational spec.rum is rec.rded to determine symmetries of molec.lar vibrations. Optic.l absorbanc. spec.rum rec.rded revealed that this c.ystal has good transparenc. in the visible region. The sec.nd harmonic.generation test of BTNB c.nfirmed the nonlinear nature of the c.ystal. The BTNB c.ystal was analyzed by a differential thermal analysis and thermogravimetric.analysis (DTA-TGA) to obtain its thermal stability. Vic.ers mic.ohardness test done on the c.ystal shows that the c.ystal has greater physic.l strength.

关键词： BTNB—Bisthiourea Nic.el Bromide SHG—Sec.nd Harmonic Generation TGA/DTA NLO—Nonlinear Optic.l

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