在PbMg1/3Nb2/3O3的X射线光子相关谱学过程中,X射线诱导的皮埃索响应
Dina Sheyfer1, Hao Zheng1, Matthew Krogstad1
1Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA.
Journal of synchrotron radiation
|November 6, 2023
概括
X射线光子相关谱 (XPCS) 揭示了在电场下放松或铁电PMN的动态倾斜. 这种倾斜是由X射线诱导的充电和电阻所驱动的,影响了材料动力学研究的解释.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 铁路电力是铁路的电力.
背景情况:
- X射线光子相关谱 (XPCS) 是一种强大的技术,用于探测材料中的原子尺度动力学.
- 放松铁电,如PbMg1/3Nb2/3O3 (PMN),表现出复杂的极性纳米域行为.
- 了解材料对外部刺激的反应对于技术应用至关重要.
研究的目的:
- 用现场XPCS.使用PMN中极性纳米域的动态反应进行调查.
- 阐明在交流电场下观察到的动态倾斜背后的机制.
- 开发一个模型,解释X射线照明,电场和材料反应之间的相互作用.
主要方法:
- 在现场X射线光子相关谱 (XPCS) 测量.
- 使用两次相关函数分析分散的散射斑点.
- 布拉格峰值运动分析以检测动态倾斜.
- 开发一个结合静电充电和电约束的理论模型.
主要成果:
- 一个弱的交流电场诱导了PMN中照明体积的显著动态倾斜.
- 观察到的倾斜量化解释了两次斑点相关性.
- 倾斜的幅度超过了仅基于应用场和电阻的预期.
- 一个涉及X射线诱导的表面充电和电阻的模型成功地解释了观察到的倾斜.
结论:
- 在解释XPCS和AC场下的绝缘材料的纳米衍射数据时,X射线诱导的压力响应是关键因素.
- 这些发现凸显了在动态研究中考虑光束样本相互作用的重要性.
- 这项工作为了解放松或铁电动力学以及散射实验中的潜在工件提供了新的视角.
相关概念视频
02:18X-ray Crystallography
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...
01:10X-ray Diffraction of Biological Samples
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 crystal...
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 crystal...
01:24X-ray Imaging
German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with X-rays, and by 1900, X-ray was widely...