DIELECTRIC, ELECTROMECHANICAL AND FERROELECTRIC PROPERTIES OF (Na_0.5Bi_0.5)(Nd_xTi_1-2xNb_x)O₃ RELAXOR CERAMICS

Abstract

Polycrystalline ( Na 0.5 Bi 0.5 )( Nd x Ti 1-2x Nb x ) O 3 ceramics with perovskite structure were prepared through the solid state sintering route. The prepared samples were studied for their dielectric, electromechanical and ferroelectric properties. Dielectric measurements showed relaxor behavior. From electromechanical studies, a relatively high electro-mechanical coupling factor, k t (in the range 0.69–0.73) depending upon composition was observed. Among the samples studied, x = 0.0125 exhibited a higher value of remanant polarization (~ 0.50 μ C/cm 2 at coercive field (E c = 6.30 kV/cm )).