揭示了Ni3Fe纳米颗粒中的核心-结构形成,使用现场多支架连贯衍射成像
Corentin Chatelier1,2, Clément Atlan1,2, Maxime Dupraz1,2
1Université Grenoble Alpes, CEA Grenoble, IRIG, MEM, NRX, 17 Rue des Martyrs, F-38000 Grenoble, France.
ACS nano
|May 16, 2024
概括
高温触发了Ni3Fe纳米颗粒的脱过程,形成了具有明显格子参数的紧张核心外结构. 这种转换改变了纳米粒子形态,揭示了对固态反应的洞察力.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 固态化学 固态化学
背景情况:
- 固态反应是材料科学的基础.
- 了解纳米变化对于开发新材料至关重要.
研究的目的:
- 为了研究在高温下固态反应过程中单个Ni3Fe纳米粒子的结构演变.
- 揭示纳米粒子中核心外结构形成背后的机制.
主要方法:
- 多反射布拉格连贯衍射成像 (BCDI) 用于跟踪纳米粒子结构,形态和变形的演变.
- 现场3D成像在纳米尺度进行,温度变化.
- 原子模拟支持实验观察结果.
主要成果:
- 在Ar大气层下观察到600°C的脱过程.
- 一个高度紧张的核心外结构出现了,其特点是两个不同的格子参数 (0.4%的差异).
- 纳米粒子方面消失了,导致一个圆圆的核心外结构与一个Ni-丰富的外由于偏好的铁氧化.
结论:
- 在现场多反射 BCDI 是研究纳米级固态反应的强大技术.
- 该研究提供了详细的洞察力,在纳米粒子的固态反应期间核心-过渡的机制.
更多相关视频
08:44Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
Published on: August 22, 2017
7.7K
10:12Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
Published on: June 19, 2018
9.0K
相关概念视频
02:18X-ray Crystallography
23.9K
The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
23.9K
01:10X-ray Diffraction of Biological Samples
3.8K
X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are scattered by the electron clouds around the sample atoms. The X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are scattered by the electron clouds around the sample atoms. The X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
3.8K