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Local Electromechanical Properties of CaCu3Ti4O12 Ceramics

Published online by Cambridge University Press:  01 February 2011

Ronald Tararam
Affiliation:
ronaldt@iq.unesp.br, Universidade Estadual Paulista, Departamento de Físico-Química, Araraquara, Brazil
Igor Bdikin
Affiliation:
bdikin@ua.pt, University of Aveiro, Department of Mechanical Engineering & TEMA, Aveiro, Portugal
Jose Varela
Affiliation:
varela@iq.unesp.br, Universidade Estadual Paulista, Departamento de Físico-Química, Araraquara, Brazil
Paulo R Bueno
Affiliation:
prbueno@iq.unesp.br, Universidade Estadual Paulista, Araraquara, Brazil
Andrei L. Kholkin
Affiliation:
kholkin@ua.pt, University of Aveiro, Department of Ceramics and Glass Engineering & CICECO, Aveiro, Portugal
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Abstract

Scanning probe microscopy (SPM) was used to probe piezoelectric vibrations and local conductivity in CaCu3Ti4O12(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.

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

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