Structural correlation to magnetodielectricity and coercivity at room temperature in multiferroic Bi0.7Ba0.3−xPbxFeO3 Original Research Article

We report an interesting structural correlation to the static dielectric constant (ϵ0), magnetodielectric (MD) response and coercivity at room temperature for Bi0.7Ba0.3−xPbxFeO3 at x = 0, 0.05, 0.10 and 0.15, above which a structurally single-phase material could not be achieved. The Pb doping leads to a ∼2.4 times increase in ϵ0. The Fe–O–Fe bond angle increases and approaches 180° with the Pb doping, which is associated with a considerable decrease in coercivity. Interestingly, the MD response is correlated with the average Bi–Fe bond length. This structural correlation is crucial for understanding the origin of moderately high MD response and improving the effects of this for technological applications.