在LaNiO3薄膜中排序压力驱动的氧空位,通过扫描传输电子显微镜中集成的差异相位对比成像揭示出来
Pritam Banerjee1,2, Pasquale Orgiani1, Arno Meingast3
1CNR-IOM Istituto Officina dei Materiali, 34139 Trieste, Italy. pritam.nitjsr@gmail.com.
Physical chemistry chemical physics : PCCP
|August 14, 2025
概括
稀土尼基酸盐薄膜中的压力诱导的有序氧空缺 (OOV) 会产生超结构调节. 压缩应变稳定了这些阶段,减少了空缺,并将它们转化为母LaNiO3阶段.
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
- 固态化学 固态化学
背景情况:
- 稀土酸盐 (例如,LaNiO3) 显示由有序氧空缺 (OOV) 影响的复杂电子特性.
- 拉德尔斯登 - 波珀 (RP) 断层可以影响这些材料的结构稳定性和电子行为.
研究的目的:
- 为了研究拉尼奥3薄膜中应变诱导的OOV相的结构稳定性.
- 分析RP故障对OOV形成和稳定性的影响.
- 为了将原子尺度的结构和组成变化与电子性质相关联.
主要方法:
- 高角环状暗场扫描传输电子显微镜 (HAADF-STEM) 和集成差相对比 (iDPC) STEM成像用于原子尺度分析.
- 几何相位分析 (GPA) 用于量化应变分布.
- 密度函数理论 (DFT) 计算以建模OOV安排和模拟iDPC-STEM成像以进行实验相关性.
主要成果:
- 观察到LaNiO3.3的化学组成和原子格子结构上的上层结构调节.
- 在LaNiO2.5阶段的Ni-O层中OOV的形成与平面外压缩应变 (~2%) 有关.
- 压缩应变稳定了OOV阶段,减少了空位度,并促进了转化到母LaNiO3阶段.
结论:
- 应变工程是控制OOV形成和稀土酸盐相稳定性的关键因素.
- 由OOV驱动的原子尺度结构和组成调制显著影响材料特性.
- 了解这些现象是设计化薄膜中新型电子和磁性功能的关键.
相关概念视频
Scanning Electron Microscopy
4.4K
A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
Fundamental Principles
Accelerated...
Fundamental Principles
Accelerated...
4.4K
Trends in Lattice Energy: Ion Size and Charge
24.2K
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:
24.2K
Electron Microscope Tomography and Single-particle Reconstruction
2.5K
Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
2.5K
Atomic Force Microscopy
3.6K
Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
3.6K
Phase Contrast and Differential Interference Contrast Microscopy
9.5K
Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
9.5K
Transmission Electron Microscopy
5.9K
In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
5.9K


