Specimen Preparation

Gault, Baptiste; Moody, Michael P.; Cairney, Julie M.; Ringer, Simon P.

doi:10.1007/978-1-4614-3436-8_4

Cited by 7 publications

(2 citation statements)

References 95 publications

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“…The needle-shaped APT specimens were prepared by using a Thermo Fisher Nova 200 dual-beam focused ion beam (FIB)/scanning electron microscope (SEM). The sharp APT needles were prepared by following standard site-specific lift-out and annular milling methods. , The APT data acquisition was performed on a CAMECA LEAP 4000X HR instrument in laser mode (laser wavelength (λ) = 355 nm) with a laser energy of 100–125 pJ, a specimen temperature of 50 K, a pulse repetition rate of 200 kHz, and a 0.5% detection rate. The APT data analysis was conducted using CAMECA’s Integrated Visualization and Analysis Software (IVAS 3.8).…”

Section: Experiments and Methodsmentioning

confidence: 99%

Understanding the Structural–Chemical Evolution of Epitaxial NbN/Al₂O₃/NbN Trilayers with Varying NbN Thickness

Sarker,

Garg,

Zhu

et al. 2023

ACS Appl. Eng. Mater.

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Epitaxial NbN/Al 2 O 3 /NbN trilayer structures with NbN thicknesses of 50−200 nm were grown by pulsed laser deposition. Within each trilayer configuration, it was observed that the top NbN layers exhibited slightly reduced crystallinity compared to the bottom NbN layers due to the strain-induced effects caused by the lattice mismatch between NbN and Al 2 O 3 . Notably, the trilayer structures exhibited epitaxial growth with consistent in-plane rotational orientations in the NbN layers. Significant deviations in the stoichiometry of the NbN layers were detected, primarily stemming from N-deficient and O-rich regions. Moreover, the chemical non-uniformity within the NbN layers intensified as the layer thickness decreased. The lateral N/Nb distribution showed a complementary distribution with O/Nb, resulting from a higher tendency for NbO x formation with lower NbN thicknesses. To gain a deeper understanding of the formation and impacts of local point defects, such as nitrogen vacancies and oxygen impurities, density functional theory (DFT) calculations were employed. The obtained defect formation energies suggest that O substitutional defects will prevail in an oxygen-rich environment over N vacancies. The investigation further explored the role of these defects in tuning the electronic states at the Fermi level.

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Section: Experiments and Methodsmentioning

confidence: 99%

Understanding the Structural–Chemical Evolution of Epitaxial NbN/Al₂O₃/NbN Trilayers with Varying NbN Thickness

Sarker,

Garg,

Zhu

et al. 2023

ACS Appl. Eng. Mater.

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“…In contrast to TEM and FIM techniques, TKD technique has a higher field of view [88], [89]. Besides, obtaining orientation information using TKD is much easier as compared to that using TEM and/or FIM techniques [90]. One of the limitations of APT is the influence of projection and lens effects on the allocation of atoms to a particular GB [91]- [93].…”

Section: Common Techniques For the Characterisation Of Gb Segregationmentioning

confidence: 99%

Grain Boundary Segregation In Steels: Towards Engineering The Design Of Internal Interfaces<strong> </strong>

Saha¹

2022

Preprint

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Solute decoration at grain boundaries (GB) leads to a number of phenomenon such as changes in interface structure, mobility, cohesion etc. Recent experimental investigations on interfacial segregation in steels are based on microstructural characterisation using two correlative methodologies, namely, Transmission Electron Microscopy-Atom Probe Tomography (APT) and Electron Backscatter Diffraction-APT. Considering the growing interest in this avenue, the present review is aimed at addressing the common adsorption isotherms used for quantifying interfacial segregation and providing an overview of the present state of experimental research in the area of GB segregation in steels. The areas where an understanding of GB segregation may be utilised have also been highlighted with a focus on the experimental challenges associated with understanding GB segregation in steels.

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Effect of Mn and C on Grain Growth in Mn Steels

Bhattacharyya

Langelier

Purdy

et al. 2018

Metall Mater Trans A

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Specimen Preparation

Cited by 7 publications

References 95 publications

Understanding the Structural–Chemical Evolution of Epitaxial NbN/Al₂O₃/NbN Trilayers with Varying NbN Thickness

Understanding the Structural–Chemical Evolution of Epitaxial NbN/Al₂O₃/NbN Trilayers with Varying NbN Thickness

Grain Boundary Segregation In Steels: Towards Engineering The Design Of Internal Interfaces<strong> </strong>

Effect of Mn and C on Grain Growth in Mn Steels

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Specimen Preparation

Cited by 7 publications

References 95 publications

Understanding the Structural–Chemical Evolution of Epitaxial NbN/Al2O3/NbN Trilayers with Varying NbN Thickness

Understanding the Structural–Chemical Evolution of Epitaxial NbN/Al2O3/NbN Trilayers with Varying NbN Thickness

Grain Boundary Segregation In Steels: Towards Engineering The Design Of Internal Interfaces<strong> </strong>

Effect of Mn and C on Grain Growth in Mn Steels

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Product

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Understanding the Structural–Chemical Evolution of Epitaxial NbN/Al₂O₃/NbN Trilayers with Varying NbN Thickness

Understanding the Structural–Chemical Evolution of Epitaxial NbN/Al₂O₃/NbN Trilayers with Varying NbN Thickness