Interpreting atom probe data from chromium oxide scales

Fontaine, Alexandre; Gault, Baptiste; Breen, Andrew J.; Stephenson, Leigh T.; Ceguerra, Anna V.; Yang, Limei; Nguyen, Thuan Dinh; Zhang, Jianqiang; Young, David J.; Cairney, Julie M.

doi:10.1016/j.ultramic.2015.02.005

Cited by 32 publications

(20 citation statements)

References 28 publications

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“…Normally the specimen base temperature only varies within 100 K, however after the interaction with the laser beam, the temperature of the tip apex can increase by a few hundred Kelvin (Lee et al, 1980; Kellogg, 1981; Marquis & Gault, 2008; Diercks & Gorman, 2015). In contrast to our results, earlier work in copper showed that mass resolution is degraded by increasing the pulse energy or specimen base temperature (Kolli & Meisenkothen, 2014). A possible reason is that, in that work, a much higher detection rate has been adopted (10 ions detected every 1,000 pulse).…”

Section: Discussioncontrasting

confidence: 99%

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

et al. 2017

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Cemented tungsten carbide has been analyzed using laser-pulsed atom probe tomography (APT). The influence of experimental parameters, including laser pulse energy, pulse repetition rate, and specimen base temperature, on the acquired data were evaluated from different aspects, such as mass spectrum, chemical composition, noise-to-signal ratio, and multiple events. Within all the applied analysis conditions, only 1 MHz pulse repetition rate led to a strong detector saturation effect, resulting in a largely biased chemical composition. A comparative study of the laser energy settings showed that an ~12 times higher energy was required for the less focused green laser of the LEAPTM 3000X HR system to achieve a similar evaporation field as the finer spot ultraviolet laser of the LEAPTM 5000 XS system.

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Section: Discussioncontrasting

confidence: 99%

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

et al. 2017

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“…The observed ratio between the Li isotopes 7 Li and 6 Li after subtracting the exponentially decaying noise level is 7 Li/ 6 Li=12.06, which is in good agreement with the theoretical value of 12.16 for a natural isotope mixture. Additionally, peaks for molecules of Mn and O with different charge states are found, as typically observed for oxides . The hydrogen assigned to the peaks at m / z =1, 2, and 3 amu most likely stems from residual gas in the chamber, which is field ionized at the sample apex and does not originate from the analyzed material itself .…”

Section: Resultsmentioning

confidence: 99%

“…Additionally,peaks for molecules of Mn andOwith different charge states are found, as typically observed for oxides. [18,19,[30][31][32][33] Theh ydrogen assigned to the peaks at m/z = 1, 2, and 3amu most likely stems from residual gas in the chamber, which is field ionized at the sample apex and does not originate from the analyzed material itself. [34,35] At m/z = 69 amu, as ignal from Ga is visible in the overall mass spectrum.…”

Section: Compositionmentioning

confidence: 99%

Three‐Dimensional Microstructural Characterization of Lithium Manganese Oxide with Atom Probe Tomography

et al. 2016

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The microstructure of the active material of Li‐ion batteries has a crucial influence on local ion‐transport processes but is not yet well characterized. Atom probe tomography (APT), a method combining sub‐nanometer spatial resolution with sub‐parts‐per‐thousand chemical resolution is well suited for 3 D microstructural characterization. Herein, the results of the characterization of lithium (nickel)manganese oxides [L(N)MO] with APT are presented. Structural and chemical defects of different dimensions such as the segregation of Na impurities to grain boundaries and the appearance of a Ni‐rich foreign phase are detected. Furthermore, a lamellar microstructure correlated to fluctuations in the local Li content was observed, and its influence on Li transport in the material is discussed. In defect‐free regions, the lattice planes of LMO are reconstructed for the first time, and the high spatial resolution of APT is revealed. Thus, the results demonstrate the potential of APT for the 3 D microstructural characterization of LMO.

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“…Hudson et al performed systematic analyses on trace elements in Zr samples and concluded that ranging the full width nine-tenth maximum of each peak provided the analysed composition closest to the nominal value (Hudson et al, 2011). La Fontaine et al established that the difference between the two extreme ways of ranging (from full-width-nine-tenth-maximum to background-to-background) were equivalent within the error bars for oxidised stainless steel (La Fontaine et al, 2015). The compositions measured using several different methodologies in the present work are shown in Table 1.…”

Section: Discussionmentioning

confidence: 99%

Nanoscale Stoichiometric Analysis of a High-Temperature Superconductor by Atom Probe Tomography

et al. 2017

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The functional properties of the high-temperature superconductor Y1Ba2Cu3O7-δ (Y-123) are closely correlated to the exact stoichiometry and oxygen content. Exceeding the critical value of 1 oxygen vacancy for every five unit cells (δ>0.2, which translates to a 1.5 at% deviation from the nominal oxygen stoichiometry of Y7.7Ba15.3Cu23O54-δ ) is sufficient to alter the superconducting properties. Stoichiometry at the nanometer scale, particularly of oxygen and other lighter elements, is extremely difficult to quantify in complex functional ceramics by most currently available analytical techniques. The present study is an analysis and optimization of the experimental conditions required to quantify the local nanoscale stoichiometry of single crystal yttrium barium copper oxide (YBCO) samples in three dimensions by atom probe tomography (APT). APT analysis required systematic exploration of a wide range of data acquisition and processing conditions to calibrate the measurements. Laser pulse energy, ion identification, and the choice of range widths were all found to influence composition measurements. The final composition obtained from melt-grown crystals with optimized superconducting properties was Y7.9Ba10.4Cu24.4O57.2.

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Interpreting atom probe data from chromium oxide scales

Cited by 32 publications

References 28 publications

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

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

Three‐Dimensional Microstructural Characterization of Lithium Manganese Oxide with Atom Probe Tomography

Nanoscale Stoichiometric Analysis of a High-Temperature Superconductor by Atom Probe Tomography

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