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Enhanced magneto-dielectric coupling in ZNCFO/BaTiO3 composites: synthesis, structural analysis, and property correlation
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DOI：10.1007/s42247-026-01475-8.png)
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Abstract
En 中文
In this study, Zn0.4Ni0.4Co0.2Fe2O4 (ZNCFO) ferrite nanoparticles were synthesized via a Sol-gel auto-combustion method using high-purity metal nitrates and citric acid as a fuel, followed by calcination at 600 °C to yield a phase-pure spinel structure. Barium titanate (BaTiO3 or BTO) employed in its cubic phase without further purification, was incorporated into the ferrite matrix at nominal concentrations of 0.10, 0.15, and 0.20 wt% through solid-state reaction method. Polyvinyl alcohol (PVA) was added as a temporary binder prior to palletization, and all composites were sintered at 700 °C to promote densification and interfacial compatibility. X-ray diffraction (XRD) confirmed the coexistence of cubic spinel ferrite and cubic perovskite BaTiO3 phases without evidence of secondary phases or structural degradation. The observed sharp and well-resolved peaks for both ZNCFO and BaTiO3 indicate high crystallinity, with average crystallite sizes of approximately 37.80 nm and 39.41 nm, respectively. Fourier-transform infrared spectroscopy (FTIR) revealed characteristic M-O stretching modes for both constituents, validating the retention of their respective crystal structures within the composite. Field-emission scanning electron microscopy (FESEM) showed homogeneous grain morphology and improved microstructural density with increasing BaTiO3 content, while energy-dispersive X-ray spectroscopy (EDX) confirmed uniform elemental distribution across the samples. Magnetic measurements were carried out by vibrating sample magnetometers and indicated a progressive decrease in saturation magnetization from 60.416 emu/g for pure ZNCFO to 52.229 emu/g for the highest BaTiO3 loading, while coercivity varied relatively with BTO content. Dielectric analysis was measured using LCR meter demonstrating enhanced permittivity and reduced dielectric loss at low frequencies for the composite materials. These results underscore the tunable electromagnetic properties of z[BaTiO3]/1-z[Zn0.4Ni0.4Co0.2Fe2O4] composites, positioning them as promising candidates for various applications where cubic symmetry and functional coupling are desired. ZNCFO nanoparticles were successfully synthesized by the sol–gel auto-combustion method. z[BaTiO3]/1-z[Zn0.4Ni0.4Co0.2Fe2O4] nanocomposites were prepared by the solid-state reaction method. Structural analysis confirmed the coexistence of spinel ferrite and perovskite BaTiO3 phases. Magnetic saturation was decreased with BaTiO3 content. Dielectric properties improved with BaTiO3 incorporation. A clear correlation was observed between structure, microstructure, and functional properties.
Keywords:
ZNCFO
Sol-gel auto combustion
BaTiO3
Solid state reaction method
Nanocomposite
Magnetic characteristics
Dielectric properties
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4.1
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503
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2.8K
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