Abstract The review is focused on the phenomenological description of the elastic defects influence on the electrophysical properties of nanosized ferroics. Using the Landau-Ginzburg-Devonshire phenomenological approach we consider the contribution of the elastic defects (e.g. neutral oxygen vacancies) on the phase transitions temperatures, phase diagrams, piezo-resistive, dielectric and polar properties of thin ferroelectric films and nanoparticles. We pay special attention to the role of flexoelectric effect, Vegard strains and stresses, including their synergy, called flexo-chemical coupling, on the defect-driven phenomena in nanoferroics. We explore the influence of mobile charged defects migration (e.g. the drift and diffusion of cations or charged oxygen vacancies) on the domain structure evolution in thin ferroelectric films. Also, we discuss the possibilities of the uncharged elastic defects self-ordering ordering in thin strained oxide films, and show that a thermodynamically stable disordered phase, spatially modulated phases, and long-range ordered phases with defect layers parallel or perpendicular to substrate plane can appear in the phase diagram in dependence on the film-substrate mismatch strain, concentration of elastic defects and Vegard coefficients. Since the long-range ordered ferroic phases can become multiferroic when some elastic dipoles become electric ones, the obtained results open the way to create and control defect-ordered superstructures by the choice of appropriate substrate and defect concentration in thin ferroic films.

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铁质中缺陷驱动的柔性化学现象的现象学理论

摘要 综述的重点是弹性缺陷对纳米铁质材料电物理性能影响的现象学描述。使用 Landau-Ginzburg-Devonshire 现象学方法，我们考虑了弹性缺陷（例如中性氧空位）对薄铁电薄膜和纳米粒子的相变温度、相图、压阻、介电和极性特性的贡献。我们特别关注柔性电效应、Vegard 应变和应力的作用，包括它们的协同作用，称为柔性化学耦合，对纳米铁质中的缺陷驱动现象。我们探索了移动带电缺陷迁移（例如，阳离子或带电氧空位的漂移和扩散）对薄铁电膜中畴结构演变的影响。还，我们讨论了薄应变氧化物薄膜中不带电弹性缺陷自排序的可能性，并表明热力学稳定的无序相、空间调制相和具有平行或垂直于衬底平面的缺陷层的长程有序相可以出现在相图依赖于薄膜-基板失配应变、弹性缺陷浓度和 Vegard 系数。由于当一些弹性偶极子变成电偶极子时，长程有序铁相可以变成多铁性，因此获得的结果为通过选择适当的衬底和薄铁膜中的缺陷浓度来创建和控制缺陷有序超结构开辟了道路。并表明热力学稳定的无序相、空间调制相和具有平行或垂直于衬底平面的缺陷层的长程有序相可以出现在相图中，这取决于薄膜-衬底失配应变、弹性缺陷的浓度和 Vegard系数。由于当一些弹性偶极子变成电偶极子时，长程有序铁相可以变成多铁性，因此获得的结果为通过选择适当的衬底和薄铁膜中的缺陷浓度来创建和控制缺陷有序超结构开辟了道路。并表明热力学稳定的无序相、空间调制相和具有平行或垂直于衬底平面的缺陷层的长程有序相可以出现在相图中，这取决于薄膜-衬底失配应变、弹性缺陷的浓度和 Vegard系数。由于当一些弹性偶极子变成电偶极子时，长程有序铁相可以变成多铁性，因此获得的结果为通过选择适当的衬底和薄铁膜中的缺陷浓度来创建和控制缺陷有序超结构开辟了道路。弹性缺陷的浓度和 Vegard 系数。由于当一些弹性偶极子变成电偶极子时，长程有序铁相可以变成多铁性，因此获得的结果为通过选择适当的衬底和薄铁膜中的缺陷浓度来创建和控制缺陷有序超结构开辟了道路。弹性缺陷的浓度和 Vegard 系数。由于当一些弹性偶极子变成电偶极子时，长程有序铁相可以变成多铁性，因此获得的结果为通过选择适当的衬底和薄铁膜中的缺陷浓度来创建和控制缺陷有序超结构开辟了道路。