• Mishra, Aditya
• Rout, Ashish
• Ranjan, Rajeev
• Ali, Amanat
• Singh, Ram Prakash
• Basumatary, Himalay

Abstract

<jats:p> There is a growing interest in BiFeO<jats:sub>3</jats:sub>-based alloys because of the possibility it offers for developing high-temperature high-performance piezoelectric materials and for their interesting multiferroic properties. Often such ceramics are synthesized with additives either to reduce/suppress leakage current that the system inherits from the parent compound BiFeO<jats:sub>3</jats:sub> or to promote sintering via formation of the liquid phase. We demonstrate here the propensity for stabilizing ferromagnetism in the ferroelectric solid solution BiFeO<jats:sub>3</jats:sub>–PbTiO<jats:sub>3</jats:sub> (BF–PT) when synthesized with additive MnO<jats:sub>2</jats:sub>. Detailed investigation revealed that the ferromagnetic property of the ceramic is extrinsic and caused by the additive enabled precipitation of trace amount of the ferrimagnetic Pb-hexaferrite phase, not easily detected in conventional x-ray diffraction measurements. We also show that the ferromagnetic property is induced in Co-modified BF–PT. However, in this case, the additive stabilizes the CoFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> spinel ferrite phase. While our findings offer a strategy to develop particulate magnetoelectric multiferroic composites using additive assisted precipitation of the ferrimagnetic phase(s) in BiFeO<jats:sub>3</jats:sub>-based ferroelectric alloys, it also helps in better understanding of the electromechanical response in BFO-based alloys. </jats:p>

Topics

• impedance spectroscopy
• compound
• x-ray diffraction
• composite
• precipitation
• ceramic
• liquid phase
• sintering
• piezoelectric material