Dispersion Studies of La Substitution on Dielectric Properties of Multiferroic BiFeO[sub 3] Ceramics

Abstract

Lanthanum (La)–substituted multiferroic Bi1−xLaxFeO3 ceramics with x = 0.0, 0.05, 0.10, 0.15, 0.20 and 0.25 have been prepared by solution combustion method. The effect of La substitution for the dispersion studies on dielectric properties of Bi1−xLaxFeO3 samples have been studied by performing x–ray diffraction (XRD) and dielectric measurements. The results of prepared samples are compared with those of bismuth ferrite (BiFeO3). In the measuring frequency of 10 KHz–1 MHz, the dielectric constants and dielectric losses for samples x = 0.20, 0.25 are almost stable and exhibited lowest dielectric loss close to 0.1. The results also shows that stabilization of crystal structure and nonuniformity in spincycloid structure by La substitution enhances the dielectric properties.