Study of structural, electrical and magnetoelectric properties of Bi0.9-xCa0.1YxFe0.9Zr0.1O3 ceramics

Abstract

Various multiferroic Bi0.9-xCa0.1YxFe0.9Zr0.1O3, (where, x = 0.00, x = 0.05, x = 0.10, x = 0.15, x = 0.20) ceramics were synthesized by the standard solid-state reaction technique. The microstructure, dielectric properties, AC conductivity, complex initial permeability, magnetization and magnetoelectric (ME) coefficient of the compositions were investigated. The X-ray diffraction pattern indicated that Yittrium (Y) doped BiFeO3 (BFO) ceramics showed a distorted rhombohedral structure. The average grain size was observed to be increased with increasing Y content. The value of dielectric constant was found decreasing whereas dielectric loss decreasing significantly with increasing of Y content. The Bi0.9-xCa0.1YxFe0.9Zr0.1O3, (where, x = 0.20) ceramics had lower value of than those of Bi0.9-xCa0.1YxFe0.9Zr0.1O3, (where, x = 0.00, x = 0.05, x = 0.10, x = 0.15) ceramics. The complex initial permeability was improved with increasing Y concentration and after a certain frequency it was decreases, because of reduced oxygen vacancies which helped to move the domain wall easily. The dielectric and magnetic loss were decreased with the increase of Y content. M-H hysteresis loop was measured for various samples at room temperature and enhanced magnetization was noticed because of the addition of Y in rare earth doped BFO. An enhanced ME coupling was also observed in the studied samples and the highest values of ME coefficient (αME) was obtained 230 (µVcm-1Oe-1) for the composition x = 0.20.