Abstract
In the present work, lead-free magnetoelectric composites (1 ̶x)K0.5Na0.5NbO3–(x)MnFe2O4 (x = 0, 0.2, 0.4, 0.6, 0.8, and 1) synthesized by solid-state reaction route have been studied for their structural, dielectric, and magnetoelectric properties. The micro-structural analysis (XRD, FESEM, EDX, FTIR, and RAMAN spectroscopy) indicates the coexistence of diphase in the composites. Compared to the individual phases, composites exhibit better electrical properties such as low leakage current, high resistivity, high dielectric constant, and low dielectric loss. I–V characteristics reveal that the conduction behavior of the composites is ohmic in nature in whole tested electric field range at room temperature. The maximum value of dielectric constant is noticed for composite with 20 wt% of MnFe2O4 among the composites. The complex modulus analysis reveals the presence of non-Debye type phenomenon with spreading of relaxation time in the composites. Nyquist plots reveal that the composites exhibit polydispersive Maxwell–Wagner relaxation. The magnetic measurements indicate that the magnetic behavior of the composites lies on the mass content of MnFe2O4 phase. The magnetization increases with MnFe2O4 weight percentage which provides information regarding the magnetoelectric effect (ME) coupling between the magnetostrictive ferromagnetic and ferroelectric phases. Furthermore, ME effect is evaluated as a function of applied magnetic field. The highest ME response of 2.02 mV/cm-Oe is observed for composite with 80 wt% content of MnFe2O4. Findings of this research make these composites worthy material for environment-friendly ME device applications.
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