|About this Abstract
||Materials Science & Technology 2011
||MS&T'11 Poster Session
||078 HRTEM Investigations in BiFeO3-PbTiO3 Multifunctional Ceramics
||Ivair Aparecido dos Santos, Valdirlei F. Freitas, Flávia R. Estrada, Luiz F. Cótica, Ducinei Garcia, José A. Eiras
|On-Site Speaker (Planned)
||Ivair Aparecido dos Santos
High-energy ball milled (0.6)BiFeO3-(0.4)PbTiO3 ceramics display piezoelectric, ferroelectric and weak ferromagnetic properties and have been intensively studied in the last years. In fact, (0.6)BiFeO3-(0.4)PbTiO3 ceramics are very attractive candidates for high-temperature piezoelectric applications, as mechanical-voltaic transducers, solid state transformers and advanced multifunctional devices. In this work, multifunctional (0.6)BiFeO3-(0.4)PbTiO3 ceramics were synthesized by high-energy ball milling. Structural characterizations were performed by x-ray and electron diffraction, and ferroelectric investigations were conducted in a Sawyer-Tower circuit. The interface between tetragonal and rhombohedral phases, the morphotropic phase boundary (MPB) region, was observed by high-resolution transmission electron microscopy. A qualitative model is proposed to elucidate the structure/property relations in these samples. The macroscopic ferroelectric behavior of the studied samples was correlated with the strain mediated energy increase in the MPB region.