ï¿½ 2014 AIP Publishing LLC. Lead-free multiferroic ceramics of 0.75Bi1-xNdxFeO3-0.25BaTiO3+1mol. % MnO2were prepared by a conventional ceramic technique and their structure, piezoelectricity, and multiferroicity were studied. The ceramics sintered at 890-990ï¿½C possess a pure perovskite structure. A morphotropic phase boundary of rhombohedral and monoclinic phases is formed at x=0.05. A small amount of Nd improves the ferroelectric and piezoelectric properties of the ceramics. The ferroelectric-paraelectric phase transition becomes gradually diffusive with x increasing. After the addition of Nd, the ferromagnetism of the ceramics is greatly enhanced by ∼320%. The increase in sintering temperature improves significantly the ferroelectric, piezoelectric, and ferromagnetic properties of the ceramics. The ceramics with x=0.05 sintered at 950-990ï¿½C possess improved ferroelectricity, piezoelectricity, magnetism and insulation with Prof 16.5-17.5 μC/cm2, d33of 113-121 pC/N, Mrof 0.127-0.138emu/g, R of ∼5ï¿½109Ωï¿½cm and high TCof 473-482ï¿½C, indicating that the ceramic is a promising candidate for room-temperature multiferroic and high-temperature piezoelectric materials.
ASJC Scopus subject areas
- Physics and Astronomy(all)