Effect of Impurities on the Crystalline Perfection of ZTS

Abstract

Zinc tris(thiourea) sulphate (ZTS) is an interesting semiorganic nonlinear optical (NLO) material. Several investigators have shown considerable interest on this due to its importance. In order to understand the effect of some closely related substances as impurities on the crystalline perfection of ZTS, we have grown from aqueous solutions pure and impurity (urea, Ni²⁺ and Mg²⁺) added ZTS single crystals and studied the crystalline perfection. Density, X-ray powder diffraction (PXRD), and Fourier transform infrared (FTIR) spectral measurements indicate that the impurity added crystals are basically ZTS but incorporated with a small amount of impurity molecules in the crystal matrix. Multicrystal X-ray diffraction analysis carried out shows that the incorporation of impurities changes the crystalline perfection. Urea added ZTS and Ni²⁺ added ZTS single crystals were found to have good crystalline perfection when compared to the Mg²⁺ added ZTS single crystal.

Keywords:

• Crystal growth
• Crystalline perfection
• Free evaporation method
• FTIR spectra
• High resolution X-ray diffraction
• Impurity added crystals
• Lattice parameters
• Multicrystal X-ray diffraction
• Nonlinear optical materials
• Nonlinear optics
• Second harmonic generation
• Single crystals
• Solution method
• X-ray powder diffraction
• ZTS cystal

ACKNOWLEDGMENT

One of the authors (C. K. M.) thanks the Department of Science and Technology, New Delhi for the grant of a Major Research Project.