期刊
PHYSICAL REVIEW B
卷 92, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.92.094101
关键词
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资金
- Ministerio de Ciencia e Innovacion [DPI2011-26589, FIS2013-48668]
- ERC Starting Grant [308023]
- Severo Ochoa Excellence Award of ICN2
- ICREA Funding Source: Custom
- European Research Council (ERC) [308023] Funding Source: European Research Council (ERC)
Cracks generate the largest strain gradients that any material can withstand. Flexoelectricity (coupling between strain gradient and polarization) must therefore play an important role in fracture physics. Here we use a self-consistent continuum model to evidence two consequences of flexoelectricity in fracture: the resistance to fracture increases as structural size decreases, and it becomes asymmetric with respect to the sign of polarization. The latter phenomenon manifests itself in a range of intermediate sizes where piezo- and flexoelectricity compete. In BaTiO3 at room temperature, this range spans from 0.1 to 50 nm, a typical thickness range for epitaxial ferroelectric thin films.
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