Increasing Electrical Resistivity of P-Type BiFeO₃ Ceramics by Hydrogen Peroxide-Assisted Hydrothermal Synthesis

Area of Science:

• Materials Science
• Solid State Chemistry
• Semiconductor Physics

Background:

• Bismuth ferrite (BiFeO3) is a multiferroic perovskite with diverse applications.
• High leakage current, caused by oxygen and bismuth vacancies, limits BiFeO3 performance.
• Defect engineering is crucial for overcoming these limitations.

Purpose of the Study:

• To develop a hydrothermal method for reducing bismuth vacancies in BiFeO3 ceramics.
• To investigate the effect of hydrogen peroxide on defect concentration and electrical properties.
• To improve the dielectric characteristics and reduce leakage current in BiFeO3.

Main Methods:

• Hydrothermal synthesis of BiFeO3 ceramics.
• Incorporation of hydrogen peroxide (H2O2) into the synthesis medium.
• Characterization using FT-IR and Mott-Schottky analysis.
• Electrical and dielectric property measurements.

Main Results:

• Hydrogen peroxide acted as an electron donor, controlling bismuth vacancies (V).
• Synthesized p-type BiFeO3 ceramics exhibited low conductivity.
• Achieved a 40% decrease in dielectric constant and a 3-fold reduction in dielectric loss.
• Increased electrical resistivity by 3 times compared to standard hydrothermal synthesis.

Conclusions:

• The hydrogen peroxide-assisted hydrothermal method effectively reduces bismuth vacancies in BiFeO3.
• Controlled defect concentration leads to improved dielectric properties and reduced leakage current.
• This approach offers a pathway for optimizing BiFeO3 for advanced applications.