Abstract
This chapter first give a brief review on BiFeO3 as a representative multiferroic compound, which has received increasing attention as a lead-free piezoelectric system because of its high Curie temperature and the earth abundance of the constituent elements. Then, the latest studies are reviewed to help the readers to attain a complete picture about phase structures of BiFeO3, especially in the form of epitaxial thin films that have been extensively investigated. Dielectric and electrical properties of bulk BiFeO3 are revisited in relation to the point defects and domain wall conductivity. In this chapter, BiFeO3–BaTiO3 system is highlighted as a promising lead-free piezoelectric system for high temperature applications. Finally, this chapter also gives an outlook on application of BiFeO3 as a multiferroic and lead-free piezoelectric material.
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