The effect of flexoelectricity on the dielectric properties of inhomogeneously strained ferroelectric thin films

被引:249
作者
Catalan, G
Sinnamon, LJ
Gregg, JM
机构
[1] IMEDEA, Esporles 07190, Mallorca, Spain
[2] Queens Univ Belfast, Dept Pure & Appl Phys, Belfast BT7 1NN, Antrim, North Ireland
关键词
D O I
10.1088/0953-8984/16/13/006
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Recent experimental measurements of large flexoelectric coefficients in ferroelectric ceramics suggest that strain gradients can affect the polarization and permittivity behaviour of inhomogeneously strained ferroelectrics. Here we present a phenomenological model of the effect of flexoelectricity on the dielectric constant, polarization, Curie temperature (T-C), temperature of maximum dielectric constant (T-m) and temperature of the onset of reversible polarization (T-ferro) for ferroelectric thin films subject to substrate-induced epitaxial strains that are allowed to relax with thickness, and the qualitative and quantitative predictions of the model are compared with experimental results for (Ba0.5Sr0.5)TiO3 thin films on SrRuO3 electrodes. It is shown that flexoelectricity can play an important role in decreasing the maximum dielectric constant of ferroelectric thin films under inhomogeneous in-plane strain, regardless of the sign of the strain gradient.
引用
收藏
页码:2253 / 2264
页数:12
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