International Journal of Scientific & Engineering Research, Volume 5, Issue 3, March-2014 21 ISSN 2229-5518 IJSER © 2014 http://www.ijser.org Dielectric and Electrical Property of the Anhydrous Diglycine Sulfate (DGS) Single Crystals Vimal Patel, S. M. Vyas, G. R. Pandya, Piyush Patel, Sanketsinh Thakor, M. P. Jani Abstract— Anhydrous Diglycine Sulfate (DGS) have been grown from aqueous solution of glycine and sulfate with slow evaporation techniques at constant temperature. The complex relative dielectric function ε*(ω) =εʹ - jε″ of mixture of Anhydrous Diglycine Sulfate with water in varying concentration have been measured using precision LCR meter in the frequency range 20Hz to 2MHz at room temperature. The dielectric/electrical properties of the liquid samples are represented in terms of intensive quantities namely, complex relative dielectric function ε*(ω), conductivity σ*(ω), electrical modulus M*(ω), and extensive quantities, i.e. complex admittance Y*(ω) and complex impedence Z*(ω). All of these properties are used to explore various processes contributed in the dielectric/electrical presentations of the mixtures. Index Terms— DGS, Precision LCR meter, Complex relative dielectric function, electrical modulus, Complex admittance, Complex impedence, conductivity. ——————————  —————————— 1 INTRODUCTION HE most well known glycine sulfate compounds is Tri- glycine sulfate (TGS) and Anhydrous Diglycine Sulfate (DGS) which have been grown from aqueous solution of glycine and sulfate. DGS exhibits non-ferroelectric property [1], [2], [3], [4], [5], [6], [7]. Whipps et al [3], Wood and Holden [2] have reported that when proportions of amino acid and sulfuric acid are taken in equal molar ratio, they obtained An- hydrous Diglycine Sulfate (DGS) single crystals. It has an or- thorhombic structure and exhibits perfect cleavage along the (0 1 0) plane [1]. From the literature survey it has been found that little work has been on the dielectric and morphological properties of the anhydrous diglycine sulfate [5], [6]. Sangwa at al [8] has studied the dielectric measurement, proved to be a powerful method to study of molecular structure, solute- solute and solute-solevent interaction. The investigation of broadband dielectric spectroscopy (BDS) of the materials covers now a days the extraordinary spectral range from 10 -6 to 10 12 Hz [9]. The BDS characteriza- tion of the dielectric materials provide the confirmative infor- mation on the intra- and intermolecular dynamics, the degree of intermolecular H-bond interactions, cooperation between guest and host molecules and ionic and electrode polarization processes related to the molecular structures [10], [11]. In the past, several attemps have been made to study the dynamics of polar solvents regarding the confirmation of their structural behaviour in microwave dielectric relaxation measurements. However, not much has been done in the frequency range of 20Hz to 2MHz, where the interference between ionic conduc- tion, electrode polarization and structure relaxation may be the largest, owing to the fact that in complex systems atomic, ionic or molecular units have non-trivial interactions between them. In this paper we study the dielectric spectroscopy over the frequency range 20Hz to 2MHz of binary mixture of DGS crystal and pure water. In view of the present large interest on the molecular interaction in the liquid system, it will be highly informative to make a comparative dielectric study of the liq- uid samples DGS-water mixtures in the frequency range 20Hz to 2MHz and reporting the result of over accurately measured dielectric constant and other evaluated dielectric parameter at constant temperature. The dielectric and electrical properties of material are represented in terms of intensive quantities i.e. complex relative dielectric function ε*(ω), conductivity σ*(ω), electrical modulus M*(ω) and extensive quantities i.e. complex admittance Y*(ω), complex impedence Z*(ω). Various formula- tions are used to confirm the effect of ionic and electric polari- zation processes in the liquid mixtures. 2 EXPERIMENTAL PROCEDURE The compound was synthesized from an aqueous solution of glycine and sulfate in the molar ratio 1:1 by controlled iso- thermal evaporation at constant temperature. DGS powder samples were mixed with the water in different concentration, which is used for the study of dielectric spectroscopy over the frequency range 20Hz to 2MHz. The complex dielectric func- tion ε*(ω) of liquid samples were determined by using preci- sion LCR meter with four terminal liquid dielectric test fixture used for capacitance and resistance measurement in the fre- quency range 20Hz to 2MHz. The capacitance and parallel resistance of the dielectric liquid test fixture without samples and with samples were measured to compensate for a short. The test fixture correction coefficient was also considered to cancel the effect of stray capacitance during the evaluation of the complex relative dielectric function ε*(ω). The complex relative dielectric function ε*(ω) of the liquid samples is determined by using relation (1). [12]       − = ′ ′ − ′ = ∗ P P R C j C C j 0 0 1 ) ( ω α ε ε ω ε (1) T ———————————————— • Vimal Patel & Sanketsinh Thakor are currently pursuing M.Phil. Degree in Physics in Gujarat University, Gujarat, India, PH-09428115955 and 09726333505. E-mail: vimalpatel082013@gmail.com and thakorsanket@gmail.com. • Piyush Patel is currently pursuing Ph.D. degree in Physics in Gujarat University, Gujarat, India, PH-08980420285, E-mail: piyush_patel130@yahoo.com • Dr. S. M. Vyas is a lecturer at Department of Physics in Gujarat Universi- ty, Gujarat, India, PH-09974022542, E-mail: s_m_vyas_gu@hotmail.com. • Dr. G. R. Pandya is the retired faculty of department of Physics, faculty of science, The M. S. University of Baroda, Gujarat, India, PH-09825025789 • Dr. M. P. Jani is the M.Sc.Ph.D in Physics from the department of physics, Faculty of science, The M.S.University of Baroda, Gujarat, India, PH- 9825802319, E-mail: maunik_msu@yahoo.com. IJSER