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相关概念视频

Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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立体声接口结构驱动巴兹罗的铁电3 电影

Shan Li1, Jiaqi Li1, Yilin Wang2

  • 1Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Solid State Chemistry, University of Science and Technology Beijing, Beijing 100083, China.

Inorganic chemistry
|July 29, 2024
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概括

在3D接口中,应变工程可以使更厚的薄膜保持性能. 硫酸薄膜由于其独特的结构,在整个厚度内都表现出应变诱导的铁电.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 薄膜技术 薄膜技术

背景情况:

  • 介面应变工程是新型材料特性的关键,但受到薄膜厚度的限制.
  • 二维薄膜通常会在20nm以上失去拉伸效应.
  • 在更厚的薄膜中开发延伸应变影响的方法至关重要.

研究的目的:

  • 调查3D接口的潜力,以克服薄膜的延展限制.
  • 探索外相边界 (OPB) 在维持应变中的作用.
  • 为了在更厚的酸薄膜中获得应变诱导的铁电.

主要方法:

  • 在具有大格子不匹配的基板上制造BaZrO3薄膜.
  • 使用诱导的外相边界 (OPB) 结构.
  • 沿薄膜厚度的应变分布和铁电性质的表征.

主要成果:

  • 大格子不匹配诱导了通过薄膜厚度延伸的OPB.
  • OPB有效地紧了原子,扩大了双轴应变的空间范围.
  • 在整个BaZrO3膜中观察到均的平面应变和应变诱导的铁电性 (Pr = 13μC/cm2).

结论:

  • 使用OPB的3D接口工程有效地克服了薄膜的拉伸限制.
  • 这种方法可以制备更厚的多功能材料,具有持久的应变效应.
  • 通过OPB结构,可以在更厚的BaZrO3膜中可靠地实现应变诱导的铁电.