The Influence of Sintering Temperature on the Microstructure and Electrical Properties of BiFeO₃ Ceramics

Abstract:

This study reports the synthesis of bismuth ferrite ceramics (BiFeO₃, BFO) by the sol-gel method and the effect of different sintering temperatures (800 °C, 820 °C, 850 °C, 880 °C, 900 °C) on the crystal structure, morphology, dielectric properties and ferroelectric properties of the bismuth ferrite ceramics. It is observed that the bismuth ferrite phase are formed when the molar ratio of bismuth and ferric is 1.025 : 1, and the bismuth ferrite ceramics have less impurity phase at all the five sintering temperature. The morphology studies revealed that the grain of bismuth ferrite ceramics is spherical and the grain size increases with the increasing of the sintering temperature. When the bismuth ferrite ceramics with excessive bismuth sintered at 820 °C, it exhibits the higher dielectric constant and the lower dielectric loss, the remnant polarization and the coercive field are 0.35 μC/cm² and 4.03kV/cm, respectively. The observed ferroelectricity in bismuth ferrite ceramics owes to the point defects associated with oxygen vacancy defects as well as the smaller size effect.

• Periodical: Key Engineering Materials (Volumes 602-603)
• Pages: 942-946
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.602-603.942
• Online since: March 2014
• Authors: Xiao Ling Deng, Xing Bing Liu, Wei Cai, Chun Lin Fu, Jia Mu Huang
• Keywords: Bismuth Ferrite, Electric Properties, Microstructure

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