Influence of Bismuth Ferrite on Dielectric and Ferroelectric Properties of Strontium Iron Niobate Lead-Free Ceramics

Abstract

Effects of BiFeO₃ (BFO) on the properties of strontium iron niobate, Sr(Fe_0.5Nb_0.5)O₃ ceramics were investigated and synthesized using a conventional solid-state reaction method. X-ray diffraction analysis revealed that all ceramics exhibited a single perovskite structure with orthorhombic symmetry. The x = 0.05 ceramic showed a very high dielectric constant (ε_r > 40,680 at 1 kHz). By using a complex impedance analysis technique, bulk, grain boundary, and electrode responses were found to affect the dielectric behavior which could be related to the Maxwell–Wagner polarization mechanism. Furthermore, ferroelectric behavior was also found to improve for a higher amount of BFO content.

Keywords:

• Strontium iron niobate
• high dielectric materials
• bismuth ferrite
• perovskite

Acknowledgments

The authors would like to thank Prof. Dr. Gobwute Rujijanagul of Chiang Mai University, Faculty of Agro-Industrial Technology, Rajamangala University of Technology Tawan-ok Chantaburi Campus, Chantaburi and Rajamangala University of Technology Tawan-ok for their support.