TY - JOUR
T1 - Ferroelectrics as Smart Mechanical Materials
AU - Cordero-Edwards, Kumara
AU - Domingo, Neus
AU - Abdollahi, Amir
AU - Sort, Jordi
AU - Catalan, Gustau
PY - 2017/10/4
Y1 - 2017/10/4
N2 - Weinheim 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.
AB - Weinheim 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.
KW - ferroelectric memories
KW - ferroelectricity
KW - flexoelectricity
KW - mechanical properties
KW - mechanical reading polarity
U2 - 10.1002/adma.201702210
DO - 10.1002/adma.201702210
M3 - Article
SN - 0935-9648
VL - 29
JO - Advanced Materials
JF - Advanced Materials
IS - 37
M1 - 1702210
ER -