Actas de congresos
Local electromethanical properties of the CaCu 3Ti 4O 12 ceramics
Fecha
2010-12-01Registro en:
Materials Research Society Symposium Proceedings, v. 1255, p. 6-10.
0272-9172
10.1557/PROC-1255-M03-19
2-s2.0-79952000954
0477045906733254
0000-0003-2827-0208
Autor
Universidade Estadual Paulista (Unesp)
University of Aveiro
Institución
Resumen
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.