Origin Of the enhanced flexoelectricity of relaxor ferroelectrics

Jackeline Narvaez; Gustau Catalan

doi:10.1063/1.4871686

Origin Of the enhanced flexoelectricity of relaxor ferroelectrics

Materials Science 2015-06-18 v1

Authors: Jackeline Narvaez , Gustau Catalan

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

We have measured the bending-induced polarization of Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystals with compositions at the relaxor-ferroelectric phase boundary. The crystals display very large flexoelectricity, with flexocoupling coefficients an order of magnitude bigger than the theoretical upper limit set by the theories of Kogan and Tagantsev. This enhancement persists in the paraphrase up to a temperature T* that coincides with the start of elastic softening in the crystals. Analysis of the temperature dependence and cross-correlation between flexoelectric, dielectric and elastic properties indicates that the large bendinginduced polarization of relaxor ferroelectrics is not caused by intrinsically giant flexoelectricity, but by the reorientation of polar nanotwins that become ferroelastically active below T*.

Keywords

relaxor ferroelectrics flexoelectricity bending-induced polarization flexocoupling coefficients polar nanotwins elastic softening Pb(Mg1/3Nb2/3)O3-PbTiO3

Cite

@article{arxiv.1312.5870,
  title  = {Origin Of the enhanced flexoelectricity of relaxor ferroelectrics},
  author = {Jackeline Narvaez and Gustau Catalan},
  journal= {arXiv preprint arXiv:1312.5870},
  year   = {2015}
}

Related papers

View all related →