Electrical Properties Study of Silver Niobate (AgNbO3) and its Modified System (AgNb1-XMxO3) Where M=Ta(Tantalum), Sb(Antimony), V(Vanadium)

摘要

The fundamental study on effect of isovalent cationic substitution on the electric properties of silver niobate (AgNbO3) which shows week hysteresis loop of polarization vs electric field. The modification were carried out in place of pentavalent Nb (B-site of ABO3 perovskite structure) by Ta5+,Sb5+,V5+.We followed the mixed oxide route to syenthesize the compound AgNb0.9M0.1O3(M=Ta5+,Sb5+, and V5+).The formation of desired phases was confirmed by XRD technique and surface morphologies of prepared sample were photographed by FESEM. Dielectric, ferroelectric and electric transport properties were investigated. Enhanced dielectric and ferroelectric values were observed in the modified system and this enhancement is found more in Sb modified system. The relaxation behaviour of conducting dipoles was analysed by complex impedance technique. It is found that only intrinsic relaxation (grain) exists in the parent as well as in the modified system.