Effect of Y substitution on magnetic and transport properties of Ba 0 . 95 La 0 . 05 Ti 1−x Y x O 3 ceramics

Abstract

Dielectric materials with giant dielectric constant are highly demanded for their many high-tech applications. While ferroelectric BaTiO 3 inherently possesses polarization within it, high dielectric constant can only be obtained by structural as well as chemical modification. In this literature, we report the existence of high room temperature permittivity (≥10 3 ) in Ba 0 . 95 La 0 . 05 Ti 1−x Y x O 3 (where x = 0.00–0.15) ceramics prepared by the pressureless conventional sintering method. Yttrium (Y) has been doped at the B site of Ba 0 . 95 La 0 . 05 TiO 3 composition and their surface morphology, structural analysis, magnetic and transport properties have been investigated and discussed. XRD analysis confirms the formation of ABO 3 -type cubic perovskite structure of the studied compositions. The density of the prepared compositions is gradually increased with the increasing of Y content and porosity is decreased gradually. High dielectric constant and low dielectric loss with a wide range of frequency stability are observed. However, incorporation of Y in Ba 0 . 95 La 0 . 05 TiO 3 gradually decreases the dielectric constant. The study of room temperature frequency dependent permeability indicates that 5% Y doped Ba 0 . 95 La 0 . 05 TiO 3 possesses good magnetic properties. From the P-E loops, it is observed that P r and H c both are decreased with Y content. The present investigation is a fundamental step for the further improvement of the transport properties of BaTiO 3 based ceramics.