Laser-Assisted Atom Probe Tomography of Deformed Minerals: A Zircon Case Study
Laser-Assisted Atom Probe Tomography of Deformed Minerals: A Zircon Case Study
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变形矿物的激光辅助原子探针断层扫描：锆石案例研究
DOI：
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发表时间：
2017
影响因子：
2.8
通讯作者：
J. Cairney
中科院分区：
文献类型：
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作者：
A. La Fontaine;S. Piazolo;P. Trimby;Limei Yang;J. Cairney
摘要原子探针层析成像技术在矿物研究中的应用是一个迅速发展的领域。皮秒脉冲，紫外激光（UV-355 nm）辅助原子探针断层扫描已被用来分析微量元素的流动性内的位错和低角度边界的塑性变形标本的非导电矿物锆石（ZrSiO 4），一个关键的材料，以确定地球的地质事件。在这里，我们讨论了原子探针层析成像调查这一重要的矿物固有的重要实验方面，提供见解的挑战，在原子探针层析成像表征矿物作为一个整体。我们研究了原子探针层析成像分析参数对质谱特征（如热尾）以及整体数据质量的影响。对3个不同铀铅含量的锆石样品进行了分析，重点研究了质谱中的离子识别和关键微量元素铅、铀的检出限。我们还讨论了扫描电子显微镜中电子背散射衍射的相关用途，以绘制锆石颗粒的变形，以及透射菊池衍射和聚焦离子束样品制备的组合使用，以协助制备最终的原子探针尖端。
Abstract The application of atom probe tomography to the study of minerals is a rapidly growing area. Picosecond-pulsed, ultraviolet laser (UV-355 nm) assisted atom probe tomography has been used to analyze trace element mobility within dislocations and low-angle boundaries in plastically deformed specimens of the nonconductive mineral zircon (ZrSiO4), a key material to date the earth’s geological events. Here we discuss important experimental aspects inherent in the atom probe tomography investigation of this important mineral, providing insights into the challenges in atom probe tomography characterization of minerals as a whole. We studied the influence of atom probe tomography analysis parameters on features of the mass spectra, such as the thermal tail, as well as the overall data quality. Three zircon samples with different uranium and lead content were analyzed, and particular attention was paid to ion identification in the mass spectra and detection limits of the key trace elements, lead and uranium. We also discuss the correlative use of electron backscattered diffraction in a scanning electron microscope to map the deformation in the zircon grains, and the combined use of transmission Kikuchi diffraction and focused ion beam sample preparation to assist preparation of the final atom probe tip.