Abstract
Insulating BiFeO3ceramics with a small amount of secondary phase Bi2Fe4O9were prepared by rapid sintering at 840 °C using sol-gel derived fine powders. The ceramics are dense and consist of grains of 3∼8μm in size. Their leakage current density remains lower than 5.5×10−5A/cm2under the applied electrical field below 100 kV/cm. The main conduction mechanism from 50−190 kV/cm is space-charge-limited-current relating to oxygen vacancies. The ceramics exhibit a saturated ferroelectric hysteresis loop with a remanent polarization (2Pr= 22μC/cm2) under the applied field of 165 kV/cm. Weak ferromagnetism was observed with a remanent magnetization 2Mrof 1.2×10−4μB/Fe at 300 K and of 1.8×10−4μB/Fe at 10 K.
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