EFFECT OF DOPANTS ON FERROELECTRIC PROPERTIES OF TRIGLYCINE SULFATE [(NH2CH2COOH)3.H2SO4] CRYSTALS

From the measurements on the dielectric constant at fixed temperature and under varying bias condition, it is observed that pure as well as Na doped TGS samples follow the same trend as reported by Hoshino et al. An increase in the transition temperature (TC) is observed with the increase in the concentration of the dopant. The decrease in the dielectric constant (â) on either side of TCis attributed to the dipole orientation. With the increase in the doping concentration, an increase in the electrical conductivity is observed at the T. Therefore, the decrease in the dielectric constant with the increase in the concentration of the monovalent dopant Na suggests that the dopant does not interfare with the strongly bonded zwitter ion of glycine but may be attributed to the splitting of anion pair formed by the structure (NH3+CH2 COO) SO42 into nh2+ na. © 1991, Taylor & Francis Group, LLC. All rights reserved.