**4. Conclusions**

We have successfully synthesized polycrystalline Bi2Fe4O9 through solid-state reaction route. X-ray diffraction pattern confirmed the formation of Bi2Fe4O9 with the orthorhombic structure (space group *Pbam*). The obtained density of the present calcined Bi2Fe4O9 ceramic is 6.51 g/cm3 . The room temperature Raman peak at 470 cm−1 is may be due to the magnetic origin of the material and might be related to magnon scattering. The value of the dielectric constant seems to be non-variable over the entire frequency range. It has been observed that the sample showed the presence of ferroelectricity. This study conclusively reported that a significant magnetic and ferroelectric order coexist in polycrystalline Bi2Fe4O9 at room temperature. There is hysteresis in the electrical and magnetic curves, which proves the multiferroic nature of Bi2Fe4O9 and making it more suitable for advanced technology and practical applications.

## **Acknowledgements**

We acknowledge the financial support from National Natural Science Foundation of China under grant numbers 11774276 and 51074131. The authors are grateful to Dr. S. Satapathy for their long-term collaboration and numerous fruitful discussions.

**13**

**Author details**

Poorva Sharma1

\*, Ashwini Kumar1

provided the original work is properly cited.

\*, Jingyou Tang1

1 Key Laboratory of Multifunctional Materials, Department of Electronic Engineering, Luzhou Vocational and Technical College, Luzhou, Sichuan, China

2 Institute of New Materials, Wuhan University of Technology, Wuhan, China

\*Address all correspondence to: poorva@nuaa.edu.cn and 101101216@seu.edu.cn

© 2020 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium,

and Guolong Tan1,2

*Structural, Electrical, and Magnetic Properties of Mullite-Type Ceramic: Bi2Fe4O9*

All the authors declare that they have no conflict of interest.

*DOI: http://dx.doi.org/10.5772/intechopen.93280*

**Conflicts of interest**

*Structural, Electrical, and Magnetic Properties of Mullite-Type Ceramic: Bi2Fe4O9 DOI: http://dx.doi.org/10.5772/intechopen.93280*
