Influence of Li-doping on phase structure and magneto-dielectric behaviors in BiFeO3

Bi_1-xLi_xFeO₃ (x=0, 0.05, 0.10, 0.15) ceramics were synthesized by conventional solid-sate reaction method. The effect of Li¹⁺ doping on phase structure, morphological and impedance properties of Bi_1-xLi_xFeO₃ ceramics was performed. DSC studied the synthesis process of pure BiFeO₃ sample and confirmed synthesis temperature was about 825 °C. X-ray diffraction dates showed that Bi_1-xLi_xFeO₃ were stabilized in perovskite structure. The SEM images of all the samples showed grains with almost spherical morphology. The effects of Li¹⁺ doping on magnetic and dielectric permeability of Bi_1-xLi_xFeO₃ ceramics was studied over the frequency range of 1 MHz-3.0 GHz. Li¹⁺ ions doping improved magnetic and dielectric properties due to the cycloid spins were distorted by adding Li instead of Bi ions. With Li¹⁺ ions increasing, dielectric constant kept a stable value, while dielectric loss kept a low value for all the samples.