Local electromethanical properties of the CaCu 3Ti 4O 12 ceramics
Nenhuma Miniatura disponível
Data
2010-12-01
Autores
Tararam, Ronald [UNESP]
Bdikin, Igor
Varela, José Arana [UNESP]
Bueno, Paulo Roberto [UNESP]
Gracio, José
Kholkin, Andrei
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
Scanning probe microscopy (SPM) was used to probe piezoelectric vibrations and local conductivity in CaCu 3Ti 4O 12 (CCTO) ceramics at room temperature. Piezoelectric contrast was observed on the polished surfaces of CCTO in both vertical (out-of-plane) and lateral (in-plane) modes and depended on the grain orientation varying in sign and amplitude. The piezoelectric contrast is shown to be controlled by the electrical bias (local poling) and displayed a ferroelectric-like reversible hysteresis accompanied with a change of the phase of piezoelectric signal. Flexoelectric effect (strain-gradient-induced polarization) due to surface relaxation was invoked to explain the observed contrast inside the grains. © 2010 Materials Research Society.
Descrição
Palavras-chave
Electrical bias, Flexoelectric effects, Grain orientation, In-plane, Induced polarization, Out-of-plane, Piezoelectric signals, Piezoelectric vibration, Polished surfaces, Room temperature, Strain gradients, Ceramic materials, Perovskite, Probes, Scanning probe microscopy, Piezoelectricity
Como citar
Materials Research Society Symposium Proceedings, v. 1255, p. 6-10.