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<p>The current work presents a novel approach for engineering high-performance composites of lithium-doped cobalt ferrite with barium titanate and pristine lithium-doped cobalt ferrite with composition (1-x) BaTiO<sub>3</sub>—(x) Co<sub>0.8</sub>Li<sub>0.2</sub>Fe<sub>2</sub>O<sub>4</sub> (<i>x</i> = 0.2, 0.5, 0.8, and 1). These were synthesized by ‘solid-state reaction’ technique. In quest for high dielectric constant and good magnetoelectric coupling coefficient, the high-temperature dielectric, electrical, and room temperature magnetic and magnetoelectric properties have been investigated via different characterization techniques. XRD analysis followed by the Rietveld refinement revealed spinel cubic structure for pristine lithium-doped cobalt ferrite (space group Fd3m) and coexistence of cubic (Fd3m) and tetragonal phase (P4mm) in composites. Small alteration in lattice parameters signifies the amalgamation of both the phases into one another. The FESEM study suggests the inhomogeneous grains with average grain size that lies between 0.44&#xa0;μm and 0.70&#xa0;μm. The ceramics were found to be compositionally homogeneous, as evidenced by EDX analysis. ‘Impedance spectroscopy’ brings out the significant roles of both grains and grain boundaries, whereas the ‘frequency-dependent’ dielectric evaluation served to unravel the conduction mechanism. 0.2BT-0.8CLFO shows the highest dielectric constant (ε′ ̴ 20 × 10<sup>–2</sup>) among all samples measured at 1&#xa0;kHz and at a temperature of 400˚C. The Nyquist plots show that higher temperatures reduce the resistances of both the bulk and grain boundaries. M–H loop study suggests that on adding the ferrite phase in the ferroelectric phase, the non-magnetic phase also acquires the magnetic properties. Magnetoelectric properties are studied ‘room temperature,’ the value of magnetoelectric coupling coefficient is highest for 0.2BT-0.8CLFO, i.e., 41.65&#xa0;μV/cm.Oe. The developed environment-friendly ceramics are the potential candidate for their use in various application such as magnetic field sensors and memory storage devices.</p>

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Synergistic structural, dielectric, magnetic, and magnetoelectric properties in novel (1-x)BaTiO3-(x)Co0.8Li0.2Fe2O4 composites: a pathway to multiferroic device applications

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Riya Malik,
  • Ashima Hooda

摘要

The current work presents a novel approach for engineering high-performance composites of lithium-doped cobalt ferrite with barium titanate and pristine lithium-doped cobalt ferrite with composition (1-x) BaTiO3—(x) Co0.8Li0.2Fe2O4 (x = 0.2, 0.5, 0.8, and 1). These were synthesized by ‘solid-state reaction’ technique. In quest for high dielectric constant and good magnetoelectric coupling coefficient, the high-temperature dielectric, electrical, and room temperature magnetic and magnetoelectric properties have been investigated via different characterization techniques. XRD analysis followed by the Rietveld refinement revealed spinel cubic structure for pristine lithium-doped cobalt ferrite (space group Fd3m) and coexistence of cubic (Fd3m) and tetragonal phase (P4mm) in composites. Small alteration in lattice parameters signifies the amalgamation of both the phases into one another. The FESEM study suggests the inhomogeneous grains with average grain size that lies between 0.44 μm and 0.70 μm. The ceramics were found to be compositionally homogeneous, as evidenced by EDX analysis. ‘Impedance spectroscopy’ brings out the significant roles of both grains and grain boundaries, whereas the ‘frequency-dependent’ dielectric evaluation served to unravel the conduction mechanism. 0.2BT-0.8CLFO shows the highest dielectric constant (ε′ ̴ 20 × 10–2) among all samples measured at 1 kHz and at a temperature of 400˚C. The Nyquist plots show that higher temperatures reduce the resistances of both the bulk and grain boundaries. M–H loop study suggests that on adding the ferrite phase in the ferroelectric phase, the non-magnetic phase also acquires the magnetic properties. Magnetoelectric properties are studied ‘room temperature,’ the value of magnetoelectric coupling coefficient is highest for 0.2BT-0.8CLFO, i.e., 41.65 μV/cm.Oe. The developed environment-friendly ceramics are the potential candidate for their use in various application such as magnetic field sensors and memory storage devices.