Evaluation of Analysis Conditions for Laser-Pulsed Atom Probe Tomography: Example of Cemented Tungsten Carbide

Peng, Zirong; Choi, Pyuck‐Pa; Gault, Baptiste; Raabe, Dierk

doi:10.1017/s1431927616012654

Cited by 22 publications

(19 citation statements)

References 66 publications

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“…In our data, the M/DM 10 peak parameter increases with laser energy. This trend is opposite to the trend observed in zircon and rutile (Saxey et al 2018, Verberne et al 2019 but is similar to what is observed in tungsten carbide (Peng et al 2017) although it is unclear what effects the laser stepping protocol may have on peak shape. In monazite, we demonstrated that at higher laser power, the field at the apex of the specimen is reduced, suggesting that less spontaneous evaporation would occur between pulses and this could be the explanation for the narrower peaks.…”

Section: Effect Of Instrument Parameters On Data Qualitycontrasting

confidence: 65%

Nanoscale Isotopic Dating of Monazite

Fougerouse

Kirkland

Saxey

et al. 2020

Geostandard Geoanalytic Res

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Pb geochronology is widely used for dating geological processes, but current analytical techniques are limited to grains greater than 5 lm in diameter. This limitation precludes the analysis of both micrometre-scale discrete monazite grains and fine textures within monazite crystals that are commonly found in geological specimens. Here, we analyse reference materials by atom probe tomography and develop a protocol for 208 Pb/ 232 Th dating of nanoscale domains of monazite (0.0007 lm 3 analytical volume). The results indicate that the 208 Pb 2+ / 232 ThO 2+ ratios are higher than the true values. Such fractionation can be corrected using a linear regression between 208 Pb 2+ / 232 ThO 2+ and the M/ DM 10 peak shape parameter, where M is the position of the O þ 2 peak and DM 10 the full-width-at-tenth-maximum for the same peak. This correction results in 15-20% analytical uncertainty on the corrected 208 Pb/ 232 Th age. Nonetheless, this approach opens the possibility of obtaining 208 Pb/ 232 Th ages with sufficient precision to address geological questions on an unprecedented small scale. To illustrate the approach, atom probe geochronology of a small monazite grain from the contact aureole of the Fanad pluton (Ireland) yielded a 208 Pb/ 232 Th atom probe age of 420 ± 60 Ma (2s) and is consistent with the known metamorphism in the region.

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Section: Effect Of Instrument Parameters On Data Qualitycontrasting

confidence: 65%

Nanoscale Isotopic Dating of Monazite

Fougerouse

Kirkland

Saxey

et al. 2020

Geostandard Geoanalytic Res

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“…To achieve similar Si field evaporation, the LEAP 3000X HR required approximately a factor of 25 higher laser energy per pulse than the LEAP 4000X HR, in comparison to a factor of 15 difference reported for similar tools previously . An additional comparative analysis of a LEAP 3000X HR and a LEAP 5000X HR, which uses nominally the same laser system as a LEAP 4000X HR, recently showed a similar factor of 12 difference . Note that the calibration is imperfect as it is not possible to separate differences in laser spot size from laser wavelength and other uncontrollable experimental parameters (e.g.…”

Section: Methodsmentioning

confidence: 71%

Effects of optical dopants and laser wavelength on atom probe tomography analyses of borosilicate glasses

Schreiber

Neeway

et al. 2017

J Am Ceram Soc

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Atom probe tomography (APT) is a novel analytical microscopy method that provides three dimensional elemental mapping with sub-nanometer spatial resolution and has only recently been applied to insulating glass and ceramic samples. In this paper, we have studied the influence of the optical absorption in glass samples on APT characterization by introducing different transition metal optical dopants to a model borosilicate nuclear waste glass. A systematic comparison is presented of the glass optical properties and the resulting APT data quality in terms of compositional accuracy and the mass spectra quality for two APT systems: one with a green laser (532 nm, LEAP 3000X HR) and one with a UV laser (355 nm, LEAP 4000X HR). These data were also compared to the study of a more complex borosilicate glass (SON68). The results show that the analysis data quality, particularly the compositional accuracy and sample yield, was clearly linked to optical absorption when using a green laser, while for the UV laser optical doping aided in improving data yield but did not have a significant effect on compositional accuracy. Comparisons of data between the LEAP systems suggest that the smaller laser spot size of the LEAP 4000X HR played a more critical role for optimum performance than the optical dopants themselves. The smaller spot size resulted in more accurate composition measurements due to a reduced background level independent of the material's optical properties. K E Y W O R D Satom probe tomography, borosilicate glass, microscopy, nuclear waste glasses, optical properties, rare earth oxide, transition metal oxide

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“…Laser-assisted field evaporation can provide ready access to diverse types of molecular cations, which can already be noticed from literature. For instance, in the analysis of oxides, 58−62 carbides, 35,43,55 and nitrides, 50,52−54,63 oxygen, carbon, nitrogen, as well as (non)metal–oxygen, (non)metal–carbon, (non)metal–nitrogen cluster cations were observed. Large organic molecular ions were detected when measuring biological materials.…”

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confidence: 99%

Unraveling the Metastability of C_n²⁺ (n = 2–4) Clusters

Peng

Zanuttini

Gervais

et al. 2019

J. Phys. Chem. Lett.

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Pure carbon clusters have received considerable attention for a long time. However, fundamental questions, such as what the smallest stable carbon cluster dication is, remain unclear. We investigated the stability and fragmentation behavior of C n 2+ ( n = 2–4) dications using state-of-the-art atom probe tomography. These small doubly charged carbon cluster ions were produced by laser-pulsed field evaporation from a tungsten carbide field emitter. Correlation analysis of the fragments detected in coincidence reveals that they only decay to C n –1 + + C + . During C 2 2+ → C + + C + , significant kinetic energy release (∼5.75–7.8 eV) is evidenced. Through advanced experimental data processing combined with ab initio calculations and simulations, we show that the field-evaporated diatomic 12 C 2 2+ dications are either in weakly bound 3 Π u and 3 Σ g – states, quickly dissociating under the intense electric field, or in a deeply bound electronic 5 Σ u – state with lifetimes >180 ps.

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Evaluation of Analysis Conditions for Laser-Pulsed Atom Probe Tomography: Example of Cemented Tungsten Carbide

Cited by 22 publications

References 66 publications

Nanoscale Isotopic Dating of Monazite

Nanoscale Isotopic Dating of Monazite

Effects of optical dopants and laser wavelength on atom probe tomography analyses of borosilicate glasses

Unraveling the Metastability of C_n²⁺ (n = 2–4) Clusters

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Evaluation of Analysis Conditions for Laser-Pulsed Atom Probe Tomography: Example of Cemented Tungsten Carbide

Cited by 22 publications

References 66 publications

Nanoscale Isotopic Dating of Monazite

Nanoscale Isotopic Dating of Monazite

Effects of optical dopants and laser wavelength on atom probe tomography analyses of borosilicate glasses

Unraveling the Metastability of Cn2+ (n = 2–4) Clusters

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Product

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Unraveling the Metastability of C_n²⁺ (n = 2–4) Clusters