scholarly journals Atom Probe Tomography (APT) Characterization of Organics Occluded in Single Calcite Crystals: Implications for Biomineralization Studies

2019 ◽  
Vol 5 (3) ◽  
pp. 50 ◽  
Author(s):  
Alberto Pérez-Huerta ◽  
Michio Suzuki ◽  
Chiara Cappelli ◽  
Fernando Laiginhas ◽  
Hiroyuki Kintsu
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Organic Components ◽  
3D Network ◽  
Biogenic Carbonates ◽  
Synthetic Calcite ◽  
Ideal Technique ◽  
Quantitative Chemical

Occlusion of organic components in synthetic calcite crystals has been recently used as a model to understand the role of intra-crystalline organics in biominerals. However, the characterization of the distribution of both types of organics inside these calcite crystals is very challenging. Here, we discuss the potential of using the technique of atom probe tomography (APT) for such characterization, focusing on the analysis of chitin incorporation in single crystals. Additionally, APT has at least the same spatial resolution as TEM tomography, yet with the advantage of obtaining quantitative chemical data. Results show that chitin, either after degradation with yatalase or in the form of nanofibers, forms discrete clusters (2 to 5 nm) in association to water and hydronium molecules, rather than forming a 3D network inside crystals. Overall findings indicate that APT can be an ideal technique to characterize intra-crystalline organic components in abiogenic and biogenic carbonates to further advance our understanding of biomineralization.

scholarly journals Visualizing the iron atom exchange front in the Fe(II)-catalyzed recrystallization of goethite by atom probe tomography

2019 ◽  
Vol 116 (8) ◽  
pp. 2866-2874 ◽  
Author(s):  
Sandra D. Taylor ◽  
Jia Liu ◽  
Xin Zhang ◽  
Bruce W. Arey ◽  
Libor Kovarik ◽  
...  
Keyword(s):  
Cross Sections ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
Atomic Scale ◽  
Isolation And Characterization ◽  
Successful Isolation ◽  
Redox Interaction ◽  
Spatial And Temporal Characteristics

The autocatalytic redox interaction between aqueous Fe(II) and Fe(III)-(oxyhydr)oxide minerals such as goethite and hematite leads to rapid recrystallization marked, in principle, by an atom exchange (AE) front, according to bulk iron isotopic tracer studies. However, direct evidence for this AE front has been elusive given the analytical challenges of mass-resolved imaging at the nanoscale on individual crystallites. We report successful isolation and characterization of the AE front in goethite microrods by 3D atom probe tomography (APT). The microrods were reacted with Fe(II) enriched in tracer 57Fe at conditions consistent with prior bulk studies. APT analyses and 3D reconstructions on cross-sections of the microrods reveal an AE front that is spatially heterogeneous, at times penetrating several nanometers into the lattice, in a manner consistent with defect-accelerated exchange. Evidence for exchange along microstructural domain boundaries was also found, suggesting another important link between exchange extent and initial defect content. The findings provide an unprecedented view into the spatial and temporal characteristics of Fe(II)-catalyzed recrystallization at the atomic scale, and substantiate speculation regarding the role of defects controlling the dynamics of electron transfer and AE interaction at this important redox interface.

scholarly journals Atom Probe Tomography Characterization of Engineered Oxide Multilayered Structures

2015 ◽  
Vol 21 (S3) ◽  
pp. 845-846
Author(s):  
M. I. Nandasiri ◽  
N. Madaan ◽  
A. Devaraj ◽  
J. Bao ◽  
Z. Xu ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Multilayered Structures

Characterization of Nano-Sized Precipitates in a Mn-Based Lean Maraging Steel by Atom Probe Tomography

2011 ◽  
Vol 82 (2) ◽  
pp. 137-145 ◽  
Author(s):  
J. Millán ◽  
D. Ponge ◽  
D. Raabe ◽  
P. Choi ◽  
O. Dmitrieva
Keyword(s):  
Maraging Steel ◽  
Atom Probe Tomography ◽  
Atom Probe

Nanoscale characterization of powder materials by atom probe tomography

2011 ◽  
Vol 208 (2) ◽  
pp. 260-265 ◽  
Author(s):  
R. Larde ◽  
J. Bran ◽  
M. Jean ◽  
J.M. Le Breton
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Powder Materials ◽  
Nanoscale Characterization

scholarly journals Impact of the Co/Ni-Ratio on Microstructure, Thermophysical Properties and Creep Performance of Multi-Component γ′-Strengthened Superalloys

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1058
Author(s):  
Christopher H. Zenk ◽  
Nicklas Volz ◽  
Carolin Zenk ◽  
Peter J. Felfer ◽  
Steffen Neumeier
Keyword(s):  
Atom Probe Tomography ◽  
Lattice Misfit ◽  
Microstructural Characterization ◽  
Atom Probe ◽  
Creep Tests ◽  
Ni Content ◽  
Rich Alloy ◽  
First Time ◽  
Partitioning Behavior

The Ni content is a crucial factor for the development of γ′-strengthened Co-based superalloys and some studies have systematically addressed its influence on various properties in model superalloys. In this paper, we report for the first time the influence of the Co/Ni ratio in the more advanced nine-component superalloy ERBOCo-1: exchanging Co and Ni in this Co/Ni-based superalloy while keeping the other alloying elements constants has a big influence on a variety of material properties. The elemental segregation after casting is slightly more pronounced in the alloy with higher Ni-content. Microstructural characterization of this alloy termed ERBOCo-1X after heat-treatment reveals that the precipitates are cuboidal in the Co- and spherical in the Ni-rich alloy, indicating a decrease in the γ/γ′ lattice misfit. Analyzing the elemental partitioning behavior by atom probe tomography suggests that the partitioning behavior of W is responsible for that. Furthermore, it is found that even though Ni exhibits the highest overall concentration, the γ matrix phase is still Co-based, because Ni is strongly enriched in the γ′ precipitates. Creep tests at 900 °C reveal that even though the microstructure looks less favorable, the creep resistance of the Ni-rich alloy is slightly superior to the Co-rich variant.

scholarly journals Investigation of plasma-doped fin structure and characterization of dopants by atom probe tomography

2012 ◽  
Vol 101 (21) ◽  
pp. 213113 ◽  
Author(s):  
B. H. Kim ◽  
S. M. Park ◽  
S. W. Park ◽  
Y. B. Park ◽  
H. J. Kim ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe

scholarly journals The Role of Multi-Hit Detection Events on the Accurate Measurement of Boron in Atom Probe Tomography

2014 ◽  
Vol 20 (S3) ◽  
pp. 1962-1963 ◽  
Author(s):  
Frederick Meisenkothen ◽  
Ty J. Prosa ◽  
Eric B. Steel ◽  
R. Prakash Kolli
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe

A contribution to the characterization of the silicate-water interface – Part II: Atom Probe Tomography of tricalcium silicate

Micron ◽  
2018 ◽  
Vol 114 ◽  
pp. 72-77 ◽  
Author(s):  
C. Naber ◽  
T. Sowoidnich ◽  
F. Bellmann ◽  
J. Neubauer ◽  
K.A. DeRocher ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Tricalcium Silicate ◽  
Water Interface
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