相关实验视频
Updated: Mar 17, 2026

08:14
Atom Probe Tomography Analysis of Exsolved Mineral Phases
Published on: October 25, 2019
7.9K
用原子探测器断层扫描分析的莫纳石 (CePO4) 中导致组合错误的机制的探索
Tom Veret1, Fabien Delaroche1, Ivan Blum1
1Groupe de Physique des Materiaux UMR CNRS 6634, CORIA UMR 6614-UFR Sciences Site du Madrillet, Avenue de l'Université, Saint Etienne du Rouvray BP 12 76801, France.
概括
原子探头断层扫描 (APT) 可以在纳米尺度上分析莫纳 (CePO4). 优化激光设置和使用涂层可以改善分析,但需要仔细调整参数,以纠正地质样本中的元素偏差.
科学领域:
- 地质化学 地质化学
- 材料科学 材料科学 材料科学
- 分析化学 分析化学
背景情况:
- 莫纳 (CePO4) 对于U-Th-Pb地质年代学至关重要,需要纳米尺度的研究来分析同位素干扰.
- 原子探头断层扫描 (APT) 提供纳米级化学分析,但面临着CePO4等绝缘材料的挑战,特别是场蒸发期间的氧气损失.
研究的目的:
- 研究激光波长,能量,金属涂层和检测设备对合成CePO4.4质谱优化和构成精度的影响.
- 在地质材料的APT分析中识别和减轻量化偏差.
主要方法:
- 使用合成CePO4样本进行APT分析.
- 多种实验参数包括激光波长 (例如260nm),激光能量,金属涂层 (例如,) 和检测设备 (例如,带反射器的LEAP 6000 XR).
- 评估的质谱分辨率,峰值识别和组成准确性.
主要成果:
- 较短的激光波长 (260 nm) 增强了峰值分辨率,特别是在先进的反射子配置中.
- 涂料改善了散热,降低了噪音.
- 观察到氧气的系统低估和P和Ce的高估,归因于偏好的低场蒸发.
结论:
- 优化APT实验参数,如激光波长和涂层,对于准确的纳米化学分析绝缘地质材料,如石,是必不可少的.
- 需要仔细考虑元素蒸发行为,以纠正量化偏差,并提高从APT获得的地球时间学数据的可靠性.
相关概念视频
Atomic Force Microscopy
4.6K
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...
4.6K
Atomic Absorption Spectroscopy: Interference
2.3K
Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
2.3K
Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences
1.6K
Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
1.6K
Propagation of Uncertainty from Systematic Error
1.5K
The atomic mass of an element varies due to the relative ratio of its isotopes. A sample's relative proportion of oxygen isotopes influences its average atomic mass. For instance, if we were to measure the atomic mass of oxygen from a sample, the mass would be a weighted average of the isotopic masses of oxygen in that sample. Since a single sample is not likely to perfectly reflect the true atomic mass of oxygen for all the molecules of oxygen on Earth, the mass we obtain from this...
1.5K
Electron Microscope Tomography and Single-particle Reconstruction
3.0K
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...
3.0K
Atomic Absorption Spectroscopy: Lab
1.2K
For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing...
Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing...
1.2K

