Abstract
(1-x)BiFeO3@xAl2O3 ceramics with x = 0, 2.5, 5, and 7.5 mol% were prepared via the Stober coating method. The effects of Al2O3 coating on microstructure, dielectric, and ferroelectric properties had been investigated. At x = 5 and 7.5, the samples had a great Al2O3-coating effect. XRD results indicated that excessive Al2O3 coating increased the formation of secondary phases (Bi2Fe4O9 and Bi24A12O39). At x = 7.5, the sample had the highest relative density (95.8%) and lowest loss tangent (0.02 at 1 kHz ). Compared with the pure BiFeO3 sample, the Al2O3-coated samples had improved Bi-O strength and less oxygen vacancy, and the reduction of Fe3+ was decreased. The leakage current density decreased gradually. At x = 5, the sample had the highest Pr value (1.53 µC/cm2). These electric properties changes were ascribed to the generation of secondary phases, the fine grains, and the fewer vacancies.
Highlights
The multiferroic materials, which show the coexistence of multiferroic orders, can achieve the mutual control of the electric and magnetic signals
Song et al [12] prepared BiFeO3 ceramics via a two-step solid-state sintering method at 830 °C and found that the ceramics contained secondary phases, and the microstructure was inhomogeneous with a low density, resulting in a decrease of ferroelectric properties
The grain surface morphology of (1-x)BiFeO3@xAl2O3 particles was changed with the increase of the Al2O3 coating content
Summary
The multiferroic materials, which show the coexistence of multiferroic orders (ferroelectric, ferromagnetic, or ferroelasticity), can achieve the mutual control of the electric and magnetic signals. Song et al [12] prepared BiFeO3 ceramics via a two-step solid-state sintering method at 830 °C and found that the ceramics contained secondary phases, and the microstructure was inhomogeneous with a low density, resulting in a decrease of ferroelectric properties. We fabrication fine-grained (1-x)BiFeO3@xAl2O3 ceramics with different coating content, and the microstructure, dielectric and ferroelectric properties, and leakage current density of all (1-x)BiFeO3@xAl2O3 samples were investigated.
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