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Indian Institute of Technology (IIT) Patna 
A method for the synthesis of pure phase multiferroic bismuth ferrite, BiFeO3 (BFO) ceramics. 
Dr. Manoranjan Kar, Mr. Pawan Kumar 
Indian Institute of Technology (IIT) Patna 
Application type:
Applied - 2016-11-07 
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Indian Institute of Technology (IIT) Patna 
Bismuth Ferrite (BiFeO3) ceramics is a promising candidate for future ferroelectric and magnetoelectric material in the technological applications. It is a promising candidate for electric field controlled magnetic memories and magnetic field sensors. Specifically, BiFeO3¬ as ferroelectric material has large charge storage capacity than the existing ferroelectric material as lead titanate zirconate (PZT). It is also claimed that the significant scalability and 256 Mbit FeRAM can be realized using BiFeO3 ceramics, which would enable data storage capacity up to five times greater than the materials currently used in FeRAM production. However, there are some bottlenecks in the synthesis process of BiFeO3 ceramics. One is the difficulty in achieving single-phase and another is achieving highly dense as well as resistive ceramics. This invention relates to the synthesis of pure phase multiferroic BiFeO3 ceramics. This invention further relates to a simple and large-scale synthesis of pure phase multiferroic BiFeO3 ceramics and the preparation of pure phase BiFeO3-based polycrystalline solid solutions therefrom. The experimental results indicate a possible way to improve the phase purity and get the crystallite size around 30 nm which is well below the period of spin cycloid (i.e. 62 nm) which exhibits the enhanced magnetic properties for technological applications. 

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