Atom Probe Tomography Analysis of Mica
Atom Probe Tomography Analysis of Mica
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DOI：
10.1017/s1431927621012940
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发表时间：
2021-10
影响因子：
2.8
通讯作者：
Chiara Cappelli;A. Pérez-Huerta;S. B. Alam;T. Prozorov
中科院分区：
文献类型：
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作者：
Chiara Cappelli;A. Pérez-Huerta;S. B. Alam;T. Prozorov
摘要激光辅助原子探针层析成像(APT)是一种相对较新的、功能强大的亚纳米矿物和生物矿物分析技术。然而，激光辅助APT分析高度各向异性和化学多样性的矿物，如层状硅酸盐，可能被证明是特别具有挑战性的，因为在施加高电场时，晶体结构和激光脉冲之间的复杂相互作用。云母是一组具有代表性的不膨胀粘土矿物，与许多科学和技术领域相关。本研究利用APT对一种富镁黑云母进行了分析，以产生非各向同性矿物的初步数据，并研究了晶体取向对云母化学成分和结构估算的影响。从(001)和(Hk0)云母表面提取的样品所获得的结果的差异表明了实验参数和结晶学的重要性。云母的各向异性对野外蒸发过程中矿物的物理化学性质和APT数据的解释有很大的影响。本研究取得的有希望的结果为未来APT在云母和粘土矿物上的创新应用开辟了道路，并有助于对原子探针层析技术在岩土材料分析中面临的挑战进行一般性讨论。
Abstract Laser-assisted atom probe tomography (APT) is a relatively new, powerful technique for sub-nanometric mineral and biomineral analysis. However, the laser-assisted APT analysis of highly anisotropic and chemically diverse minerals, such as phyllosilicates, may prove especially challenging due to the complex interaction between the crystal structure and the laser pulse upon applying a high electric field. Micas are a representative group of nonswelling clay minerals of relevance to a number of scientific and technological fields. In this study, a Mg-rich biotite was analyzed by APT to generate preliminary data on nonisotropic minerals and to investigate the effect of the crystallographic orientation on mica chemical composition and structure estimation. The difference in results obtained for specimens extracted from the (001) and (hk0) mica surfaces indicate the importance of both experimental parameters and the crystallography. Anisotropy of mica has a strong influence on the physicochemical properties of the mineral during field evaporation and the interpretation of APT data. The promising results obtained in the present study open the way to future innovative APT applications on mica and clay minerals and contribute to the general discussion on the challenges for the analysis of geomaterials by atom probe tomography.