Ferroelectrics as smart mechanical materials

Author (s): Cordero-Edwards, K.; Domingo, N.; Abdollahi, A.; Sort, J. and Catalan, G.
Journal: Advanced Materials

Volume: 29
Pages: 1 – 6
Date: 2017

The mechanical properties of materials are insensitive to space inversion, even when they are crystallographically asymmetric. In practice, this means that turning a piezoelectric crystal upside down or switching the polarization of a ferroelectric should not change its mechanical response. Strain gradients, however, introduce an additional source of asymmetry that has mechanical consequences. Using nanoindentation and contact-resonance force microscopy, this study demonstrates that the mechanical response to indentation of a uniaxial ferroelectric (LiNbO3) does change when its polarity is switched, and use this mechanical asymmetry both to quantify its flexoelectricity and to mechanically read the sign of its ferroelectric domains.



@article {2017-ADM-CDASC,
author = {Cordero-Edwards, Kumara and Domingo, Neus and Abdollahi, Amir and Sort, Jordi and Catalan, Gustau},
title = {Ferroelectrics as Smart Mechanical Materials},
journal = {Advanced Materials},
volume = {29},
number = {37},
issn = {1521-4095},
url = {http://dx.doi.org/10.1002/adma.201702210},
doi = {10.1002/adma.201702210},
pages = {1702210--n/a},
keywords = {ferroelectricity, ferroelectric memories, flexoelectricity, mechanical properties, mechanical reading polarity},
year = {2017},
note = {1702210},