Elastic properties of zinc tris(thiourea) sulphate single crystals

Abstract

Zinc tris(thiourea) sulphate (ZTS) single crystals possess excellent nonlinear optical properties and are nearly 1.2 times more efficient than potassium dihydrogen phosphate in optical harmonic generation. Large single crystals of this material have been grown from aqueous solution. All nine second order elastic stiffness constants of this orthorhombic crystal have been determined by measuring the velocity of propagation of ultrasonic waves of longitudinal and transverse polarizations along specific symmetry directions. The McSkimin Δt correction has been applied for better accuracy of velocity values. The corresponding elastic compliance constants and Poisson’s ratios have also been evaluated. Planar plots of phase velocity, group velocity, slowness, Young’s modulus, and linear compressibility have been drawn to display the anisotropy of wave propagation in the crystal. The bulk modulus and volume compressibility of this crystal have been evaluated from the elastic constant data. Variation of a selected number of elastic constants with temperature in a limited range have also been measured and reported.

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

“…The growth, vibrational studies and defect characterizations were reported in the literature [6,7]. The elastic property of ZTS was studied by ultrasonic waves interferometric techniques [8]. In the present paper the synthesis, growth aspects, linear and nonlinear optical properties, thermal and microhardness have been reported.…”

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

“…The crystal density is 1850 kg/m 3 [2]. Under the conditions of growth applied the following walls were well [1,[7][8][9].…”

“…The crystal is particularly interesting because of its nonlinear optical properties. In the range 300 -350 K it does not show any anomalies in elastic properties [2]. In low temperatures the Raman spectroscopy data indicated anomalies at 60 K and 122 K, and the phase transition was characterised as a second order one [3].…”

“…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 elastic properties of the ZTS crystal have been investigated in a limited temperature range of 300 -350 K [2]. A Raman light scattering study has revealed the phase transitions of order-disorder type in the crystal at about 60 K and 122 K [3].…”

HUMO-LUMO Studies on Methyl Orange Doped ZTS Crystals for Laser Applications

“…The development of the theories of crystal growth has thrown more light on the understanding of crystal growth phenomena. Compared with inorganic NLO materials, organic materials may fulfill many of these requirements, but there are also some drawbacks with organic NLO materials such as environmental stability, poor chemical and mechanical stability, red-shift of the cut-off wavelength, low laser damage thresholds and poor phase matching properties [5][6][7][8][9][10][11][12]. In order to overcome these drawbacks and improve the properties, the growth of semi-organic crystals has nowadays come into prominence.…”