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Published in:
26-10-2020
Fabrication of Al2O3-coated BiFeO3 particles and fine-grained ceramics with improved electric properties
Published in: Journal of Materials Science: Materials in Electronics | Issue 23/2020
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Abstract
(1-x)BiFeO3@xAl2O3 ceramics with x = 0, 2.5, 5, and 7.5 mol% were prepared via the Stöber 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.