Crystal growth, thermal, optical and microhardness studies of tris (thiourea) zinc sulphate ‐ a semiorganic NLO material

Abstract

Tris (thiourea) zinc sulphate (ZTS), a semiorganic nonlinear optical (NLO) material has been synthesized at 30°C. The solubility was determined in different solvents such as water, ethanol and water mixture of ethanol (1:1). Good quality single crystals with size 10 x 8 x 6 mm 3 were grown by slow evaporation technique within three weeks with approximate growth rate of 0.5 mm/day. The grown crystals have been subjected to single crystal X-ray diffraction to determine the unit cell dimensions and morphology. The TGA and DTA reveal that the material has good thermal stability. The UV-Vis spectrum shows that the material has wide optical transparency in the entire visible region. The second harmonic generation was confirmed by Kurtz powder method. The birefringence of the crystal was measured in the visible region and it was found to vary with the wavelength. The microhardness test was carried out in (100) plane and the load dependent hardness was measured.

Synthesis, Growth and Characterization of Bis Thiourea Sodium Zinc Sulphate Single Crystals-A Semi Organic Nlo Material

“…There is another endothermic phase transition at 366 C due to the liberation of volatile substances like sulphur and other impurities in the compound [15][16][17]. From the DTA/TGA trace, it is seen that the compound is stable upto 251 C.…”

Elastic properties of zinc tris(thiourea) sulphate in a wide temperature range studied by Brillouin spectroscopy

“…[1,[7][8][9], and the optical [10], dielectric [11] and thermal [12] properties of the crystal have been studied. The ZTS crystals crystallise in the orthorhombic system, point group mm2 [1,13]. At room temperature the elementary cell size is a = 1.1126±0.0005 nm; b = 0.7773±0.0004 nm, c = 1.5491±0.0005 nm [13].…”

“…The zinc tris (thiourea) sulphate crystallizes in the orthorhombic system, point group mm2 at room temperature [1]. The crystal is particularly interesting because of its nonlinear optical properties.…”

Growth and Characterisation of a New Semi–Organic Nonlinear Optical TTMZS Single Crystal

“…Among semi-organic NLO materials, the metal complexes of thiourea have a low UV cut-off wavelength. This feature of Thiourea finds significant application in the fields of High Frequency Conversion and Second Harmonic Generation [4][5][6][7][8]. Thiourea being a naturally centro-symmetric molecule doesn't exhibit NLO properties; however when it forms complexes with metal ions, it NLO characteristics.…”