Abstract

The mechanisms of increasing the dielectric response of the BaTiO₃/BaZrO₃ ferroelectric superlattices in comparison with the characteristics of the bulk materials of the lattice are discussed. It is assumed that changes in the dielectric response in superlattices are caused by mechanical stresses arising in layers of the superlattice due to the mismatch of the sizes of the unit cells that make up the lattice of single-crystal layers. These stresses lead to the formation of longitudinal polarization in the layers of barium titanate and to the related contribution of the transverse component of the dielectric tensor to the effective permeability of the superlattice in the direction normal to the plane of the layers. The misfit stresses cause the appearance of a ferroelectric phase transition in the barium zirconate the lattice layers with an increase in the dielectric constant of these layers in the direction normal to the plane of the lattice layers.

Highlights: Mismatch stresses in ferroelectric superlattices

摘要

提高BaTiO ₃ /BaZrO ₃介电响应的机制讨论了铁电超晶格与晶格体材料特性的比较。假设超晶格中介电响应的变化是由超晶格层中产生的机械应力引起的，这是由于构成单晶层的晶格的晶胞尺寸不匹配。这些应力导致钛酸钡层中纵向极化的形成以及介电张量的横向分量对超晶格在垂直于层平面的方向上的有效磁导率的相关贡献。

亮点：铁电超晶格中的失配应力