Single crystal growth and characterization of tartaric acid complexes and and#945; and#947; glycines

Abstract

The present investigation deals with the single crystal growth and characterization of tartaric acid complexes and and#945;, and#947;-glycines. Nonlinear optical (NLO) materials have attracted increasing attention due to their wide applications in the area of laser technology, optical communication and data storage technology. In the thesis preface to the world of crystals, the various crystal growth techniques, fundamentals and requirements of solution growth technique, a brief introduction to nonlinear optics, second harmonic generation and outline to the characterization techniques used are presented. The structural perfection and growth features of the grown crystals were studied by using high resolution X-ray diffraction (HXRD). The dielectric studies of the grown crystals reveal that dielectric constant decreases with increasing frequency but attains saturation for higher frequencies. The grown single crystal has been analyzed by various characterization studies. 2-MImdT (C8N2O6H12) single crystal has considerable importance in nonlinear optical application viz. frequency doubling of the light produced by semiconductor laser. Single crystal X-ray diffraction (XRD) study confirms that 2-methylimidazolium d-tartrate belongs to monoclinic system with noncentro symmetric space group P21. From the X-ray diffraction analysis it is infered that and#945;-glycine crystallizes in monoclinic crystal system with space group P21/n and and#947;-glycine crystallizes in Hexaganol crystal system with space group P31. Group theoretical analysis of fundamental modes of and#945;-glycine and and#947;-glycine crystal predicts 120 and 90 total vibrational optical modes respectively. In and#947;-glycine the optical transparency below 330 nm in the UVVisible region is the most desirable characteristics for any nonlinear optical applications such as second harmonic generation. The dielectric studies indicate the and#947;-glycine possesses good optical quality with lesser defects compared to and#945;-glycine. The summary of the investigations and suggestions for future work are presented.