Single Crystal Growth and Characterization of Zinc Doped Magnesium Thiourea Acetate Crystals.

Abstract

A semi organic nonlinear optical single crystals of zinc magnesium thiourea acetate (ZMTA) were grown from slow evaporation technique at room temperature. The unit cell parameters were determined from single crystal X-ray diffraction studies. FTIR studies were performed to identify the functional groups present in the compound. The UV-Vis spectrum indicates the grown crystal has good transparency in the entire UV-Vis region spectrum suggesting the suitability of the material for NLO applications. The thermal studies show that the crystal is thermally stable up to120C. The relative second harmonic efficiency of the compound is found to be 1.64 times greater than that of KDP. …………………………………………………………………………………………………….... Introduction:-In recent development of research in nonlinear optical phenomena are involved in scientific and industrial applications. The property of second harmonic generation are focused in electro optic modulation, optical switching and also it involves in the domain of optoelectronic and photonics. Especially organic and inorganic materials are given increasing attention due to its rapid technological advances in various fields, such as laser technology, fibre optics, telecommunication, optical computing and optical data storage technology [1][2][3]. To overcome the limitation of these materials, interests have been focused on semi-organic crystals. In which it leads to explore the combined properties of both inorganic and inorganic crystals like high damage threshold, wide transparency range, less deliquescence, higher mechanical strength and thermal stabilities are obtained for device fabrication [4,5]. Recently effort has been made on metal complexes of thiourea and analogues. Inorganic matrix of thiourea molecules are an interesting material plays important role due to their large dipole moment and ability to form an extensive network of hydrogen bonds with metals [6,7]. The NLO properties of some complexes of thiourea, such as bis (thiourea) cadmium sulphate (CTS) [8], potassium thiourea bromide (PTB) [9] and zinc thiourea sulphate (ZTS) have been reported elsewhere [10]. In the present investigation, the effect of Zinc doped MTA crystals have been studied using single crystal XRD, FT-IR, UV-Vis, thermal and microhardness of the grown crystals have been carried out. The NLO property of as grown crystal has been confirmed by Kurtz powder technique. Synthesis and crystal growth:-Single crystal of zinc doped MTA material was synthesized using AR grade of Thiourea, Magnesium acetate and Zinc acetate. Double distilled water was used as a solvent. Calculated amount of (3: 0.9: 0.1) the above materials were dissolved in 100 ml of water and stirred well using magnetic stirrer. Well defined single crystals of good transparency were harvested after a period of 15 days and shown in Fig.1.