Characterising the performance of an ultrawide field-of-view 3D atom probe

Tegg, Levi; Breen, Andrew J.; Huang, Siyu; Sato, Takanori; Ringer, Simon P.; Cairney, Julie M.

doi:10.1016/j.ultramic.2023.113826

Cited by 5 publications

(3 citation statements)

References 37 publications

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“…The correlated event analysis shown here works only for instruments with no energy compensation mechanisms i.e., straight flight path machines. The Invizo 6000 series by CAMECA expands the field of view, thereby enhancing the detection of neutral atoms in oxides [48]. It is crucial to consider the location of dissociation concerning any additional lenses utilized.…”

Section: Application To the Analysis Of Direct Reduction Of Iron Oxidesmentioning

confidence: 99%

Understanding atom probe’s analytical performance for iron oxides using correlation histograms and ab initio calculations

Kim,

Bhatt,

Schreiber

et al. 2024

New J. Phys.

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Field evaporation from ionic or covalently bonded materials often leads to the emission of molecular ions. The metastability of these molecular ions, particularly under the influence of the intense electrostatic field (1010 Vm-1), makes them prone to dissociation with or without an exchange of energy amongst them. These processes can affect the analytical performance of atom probe tomography (APT). For instance, neutral species formed through dissociation may not be detected at all or with a time of flight no longer related to their mass, causing their loss from the analysis. Here, we evaluated the changes in the measured composition of FeO, Fe2O3 and Fe3O4 across a wide range of analysis conditions. Possible dissociation reactions are predicted by density-functional theory (DFT) calculations considering the spin states of the molecules. The energetically favoured reactions are traced on to the multi-hit ion correlation histograms, to confirm their existence within experiments, using an automated Python-based routine. The detected reactions are carefully analysed to reflect upon the influence of these neutrals from dissociation reactions on the performance of APT for analysing iron oxides.

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Section: Application To the Analysis Of Direct Reduction Of Iron Oxidesmentioning

confidence: 99%

Understanding atom probe’s analytical performance for iron oxides using correlation histograms and ab initio calculations

Kim,

Bhatt,

Schreiber

et al. 2024

New J. Phys.

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“…However, working with both the specimen and the micromanipulator at cryogenic temperatures presents a challenge. The GIS deposition cannot function as usual since the injected gas will non-selectively condense onto the surfaces of both the specimen and the micromanipulator, hindering the site-specific attachment [22] . To address this challenge, Schreiber et al developed a method to lift out and attach a frozen specimen onto the micromanipulator and the cooled micropost [39] .…”

Section: Cryo-specimen Fabricationmentioning

confidence: 99%

“…As depicted in Figure 2, to induce this field evaporation, a needle-shaped specimen with a tip diameter less than 100 nm is necessary. The required sharp tips can be created using either electropolishing or focused ion beam (FIB) annular milling techniques [22] . In the APT process, a high voltage of 2-15 kilovolts (kV) is applied to the needle specimen, generating a powerful electric field at the apex of the tip.…”

Section: Introductionmentioning

confidence: 99%

Cryogenic atom probe tomography and its applications: a review

Zhou,

Wang,

Niu

et al. 2023

Microstructures

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Cryogenic atom probe tomography (cryo-APT) is a new microstructure characterization technique with the potential to address challenges across various research fields. In this review, we provide an overview of the development of cryo-APT and the associated instrumentation that transforms conventional APT into cryo-APT. We start by introducing the APT principle and the instrumentation involved in the cryo-APT workflow, emphasizing the key techniques that enable cryo-APT specimen preparation. Furthermore, we shed light on the research made possible by cryo-APT, presenting several recent outcomes to demonstrate its capabilities effectively. Finally, we discuss the limitations of cryo-APT and summarize the potential research areas that can further benefit from this cutting-edge microstructural characterization technique.

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Interfacial excess of solutes across phase boundaries using atom probe microscopy

Theska,

Primig

2024

Ultramicroscopy

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Characterising the performance of an ultrawide field-of-view 3D atom probe

Cited by 5 publications

References 37 publications

Understanding atom probe’s analytical performance for iron oxides using correlation histograms and ab initio calculations

Understanding atom probe’s analytical performance for iron oxides using correlation histograms and ab initio calculations

Cryogenic atom probe tomography and its applications: a review

Interfacial excess of solutes across phase boundaries using atom probe microscopy

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