Room temperature surface piezoelectricity in SrTiO3 ceramics via piezoresponse force microscopy
authors Kholkin, A; Bdikin, I; Ostapchuk, T; Petzelt, J
nationality International
journal APPLIED PHYSICS LETTERS
author keywords dielectric polarisation; ferroelectric ceramics; ferroelectric transitions; flexoelectricity; grain boundaries; permittivity; piezoceramics; strontium compounds; vacancies (crystal)
keywords NANOGRAIN CERAMICS; GRAIN-BOUNDARIES; RAMAN RESPONSE
abstract SrTiO3 ceramics are investigated by piezoresponse force microscopy. Piezoelectric contrast is observed on polished surfaces in both vertical and lateral regimes and depends on the grain orientation varying in both sign (polarization direction) and amplitude. The observed contrast is attested to the surface piezoelectricity due to the flexoelectric effect (strain gradient-induced polarization) caused by the surface relaxation. The estimated flexoelectric coefficient is approximately one order of magnitude smaller as compared to that recently measured in SrTiO3 single crystals. The observed enhancement of piezoresponse signal at the grain boundaries is explained by the dipole moments associated with inhomogeneous distribution of oxygen vacancies.
publisher AMER INST PHYSICS
issn 0003-6951
year published 2008
volume 93
issue 22
digital object identifier (doi) 10.1063/1.3037220
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000261430600055
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