Improvements in planar feature reconstructions in atom probe tomography

Larson, David J.; Geiser, B.; Prosa, Ty J.; Gerstl, Stephan S.A.; Reinhard, David A.; Kelly, Tom

doi:10.1111/j.1365-2818.2010.03474.x

Cited by 67 publications

(54 citation statements)

References 44 publications

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“…8 for a W-Re specimen after analysis in pulselaser mode [46,47]. Similar simulations were thus run in order to estimate the image compression factor for elliptical specimen profiles, with a shank angle of 101.…”

Section: Image Compressionmentioning

confidence: 99%

Advances in the reconstruction of atom probe tomography data

et al. 2011

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Section: Image Compressionmentioning

confidence: 99%

Advances in the reconstruction of atom probe tomography data

et al. 2011

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“…Furthermore, because the specimen does not possess a perfect spherical endform, the reconstruction will contain errors whose local magnitude depends on the local deviation of the endcap from a spherical geometry (Larson et al 2011).…”

Section: Constructing the Three-dimensional Imagementioning

confidence: 99%

Nano- and micro-geochronology in Hadean and Archean zircons by atom-probe tomography and SIMS: New tools for old minerals

Valley

Reinhard

Cavosie

et al. 2015

American Mineralogist

115

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Atom-probe tomography (APT) and secondary ion mass spectrometry (SIMS) provide complementary in situ element and isotope data in minerals such as zircon. SIMS measures isotope ratios and trace elements from 1-20 μm spots with excellent accuracy and precision. APT identifies mass/ charge and three-dimensional position of individual atoms (±0.3 nm) in 100 nm-scale samples, volumes up to one million times smaller than SIMS. APT data provide unique information for understanding element and isotope distribution; crystallization and thermal history; and mechanisms of mineral reaction and exchange. This atomistic view enables evaluation of the fidelity of geochemical data for zircon because it provides new understanding of radiation damage, and can test for intracrystalline element mobility. Nano-geochronology is one application of APT in which Pb isotope ratios from sub-micrometer domains of zircon provide model ages of crystallization and identify later magmatic and metamorphic reheating.Based on SEM imaging and SIMS analysis, 11 needle-shaped specimens ~100 nm in diameter were sampled from one Archean and two Hadean zircons by focused ion-beam milling and analyzed with APT. The three-dimensional distribution of Pb and nominally incompatible elements (Y, REEs) differs at the atomic scale in each zircon. Zircon JH4.0 (4.007 Ga, Jack Hills, Western Australia) is homogeneous in Pb, Y, and REEs. In contrast, Pb and Y and REEs are clustered in sub-equant ~10 nm diameter domains, spaced 10-40 nm apart in zircons ARG2.5 (2.542 Ga, Grouse Creek Mountains, Utah) and JH4.4 (4.374 Ga, Jack Hills). Most clusters are flattened parallel to (100) or (010). U and Th are not collocated with Pb in clusters and appear to be homogeneously distributed in all three zircons. The analyzed domains experienced 4 to 8 × 10 15 α-decay events/mg due to U and Th decay and yet all zircons yield U-Pb ages by SIMS that are better than 97% concordant, consistent with annealing of most radiation damage. The 207 Pb/ 206 Pb ratios for the 100 nm-scale specimens measured by APT average 0.17 for ARG2.5, 0.42 for the JH4.0, and 0.52 for JH4.4. These ratios are less precise (±10-18% 2σ) due to the ultra-small sample size, but in excellent agreement with values measured by SIMS (0.1684, 0.4269, and 0.5472, respectively) and the crystallization ages of the zircons. Thus Pb in these clusters is radiogenic, but unsupported, meaning that the Pb is not spatially associated with its parent isotopes of U and Th. For the domain outside of clusters in JH4.4, the 207 Pb/ 206 Pb ratio is 0.3, consistent with the SIMS value of 0.2867 for the zircon overgrowth rim and an age of 3.4 Ga. In ARG2.5, all Pb is concentrated in clusters and there is no detectable Pb remaining outside of the clusters. The Pb-Y-REE-rich clusters and lack of correlation with U in ARG2.5 and JH4.4 are best explained by diffusion of Pb and other elements into ~10 nm amorphous domains formed by α-recoil. Diffusion distances of ~20 nm for these elements in crystalline zircon are consistent with heatin...

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“…Further complications arise due to crystallography, grain boundaries and other crystal defects, changes in chemistry or mineral phases. These will generally lead to local surface distortions as some atoms are preferentially evaporated out of their normal sequence due to relatively weaker or stronger bonding (Larson et al , ). Currently such distortions cannot be completely rectified, and inevitably some spatial inaccuracies will be present in reconstructions containing multiple phases, crystal defects, or significant chemical inhomogeneities (see the section entitled Technique limitations, analysis artefacts and potential solutions ).…”

Section: The Fundamentals Of Aptmentioning

confidence: 99%

Atom Probe Tomography: Development and Application to the Geosciences

Reddy

Saxey

Rickard

et al. 2020

Geostandard Geoanalytic Res

102

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Atom probe tomography (APT) is an analytical technique that provides quantitative three‐dimensional elemental and isotopic analyses at sub‐nanometre resolution across the whole periodic table. Although developed and mostly used in the materials science and semiconductor fields, recent years have seen increasing development and application in the geoscience and planetary science disciplines. Atom probe studies demonstrate compositional complexity at the nanoscale and provide fundamental new insights into the atom‐scale mechanisms taking place in minerals over geological time. Here, we provide an overview of APT, including the historical development and technical aspects of the instrumentation, and the fundamentals of data acquisition, data processing and data reconstruction. We also review previous studies and highlight the potential future applications of nanoscale geochemical studies of natural materials.

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Improvements in planar feature reconstructions in atom probe tomography

Cited by 67 publications

References 44 publications

Advances in the reconstruction of atom probe tomography data

Advances in the reconstruction of atom probe tomography data

Nano- and micro-geochronology in Hadean and Archean zircons by atom-probe tomography and SIMS: New tools for old minerals

Atom Probe Tomography: Development and Application to the Geosciences

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