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Heck, P. R.; Pellin, M. J.; Davis, A. M.; Martin, I.; Renaud, I.; Benbalagh, R.; Isheim, D.; Seidman, D. N.; Hiller, J.; Stephan, T.; Lewis, R. S.; Savina, M. R.; Maine, A.; Elam, J.; Staermann, F. J.; Zhao, X.; Daulton, T. L.; Amari, S. |
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Atom-Probe Tomographic Analyses of Presolar Silicon Carbide Grains and Meteoric Nanodiamonds – First Results on Silicon Carbide |
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2010 |
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40th Lunar and Planetary Science Conference |
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NU @ karnesky @ |
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10734 |
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Tang, Fengzai; Gault, Baptiste; Ringer, Simon P.; Martin, Phil; Bendavid, Avi; Cairney, Julie M. |
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Microstructural investigation of Ti-Si-N hard coatings |
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Journal Article |
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2010 |
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Scripta Materialia |
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63 |
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2 |
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192-195 |
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Titanium silicon nitride; Pulsed laser atom probe (PLAP); Nanostructure; Nanocomposite |
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The microstructures of nanostructured Ti-Si-N hard coatings were investigated by transmission electron microscopy and pulsed laser atom probe. C and O impurities were detected. No evidence of increased Si levels at the grain boundaries was found, suggesting that Si is either in the form of a layer too thin to be detected using the techniques employed or in the form of a solid solution of SiN clusters. |
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1359-6462 |
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NU @ karnesky @ |
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10856 |
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Martinez, E.; Fu, C.-C.; Levesque, M.; Nastar, M.; Soisson, F. |
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Simulations of decomposition kinetics of Fe-Cr solid solutions during thermal aging |
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Journal Article |
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2011 |
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Solid State Phenomena |
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172-174 |
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1016 |
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cond-mat.mtrl-sci; cond-mat.stat-mech; physics.comp-ph |
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The decomposition of Fe-Cr solid solutions during thermal aging is modeled by Atomistic Kinetic Monte Carlo (AKMC) simulations, using a rigid lattice approximation with composition dependant pair interactions that can reproduce the change of sign of the mixing energy with the alloy composition. The interactions are fitted on ab initio mixing energies and on the experimental phase diagram, as well as on the migration barriers in iron and chromium rich phases. Simulated kinetics is compared with 3D atom probe and neutron scattering experiments. |
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arXiv:1102.1091v1; 6 pages, 5 figures, PTM 2010 |
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NU @ karnesky @ |
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11018 |
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Martinez, E.; Ronsheim, P.; Barnes, J.-P.; Rochat, N.; Py, M.; Hatzistergos, M.; Renault, O.; Silly, M.; Sirotti, F.; Bertin, F.; Gambacorti, N. |
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Lanthanum diffusion in the TiN/LaOx/HfSiO/SiO2/Si stack |
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2011 |
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Microelectronic Engineering |
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Proceedings of the 17th Biennial International Insulating Films on Semiconductor Conference, 17th Bi |
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88 |
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7 |
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1349-1352 |
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Metal/high-k stack; TiN; HfSiO; La; Interfacial dipole; Threshold voltage tuning; ToF-SIMS; Apt; Atr-Ftir; S-Xps |
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Band edge Complementary Metal Oxide Semiconductor (CMOS) devices are obtained by insertion of a thin LaOx layer between the high-k (HfSiO) and metal gate (TiN). High temperature post deposition anneal induces Lanthanum diffusion across the HfSiO towards the SiO2 interfacial layer, as shown by Time of Flight Secondary Ions Mass Spectroscopy (ToF-SIMS) and Atom Probe Tomography (APT). Fourier Transform Infrared Spectroscopy in Attenuated Total Reflexion mode (ATR-FTIR) shows the formation of La-O-Si bonds at the high-k/SiO2 interface. Soft X-ray Photoelectron Spectroscopy (S-XPS) is performed after partial removal of the TiN gate. Results confirm La diffusion and changes in the La chemical environment. |
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0167-9317 |
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NU @ karnesky @ |
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11170 |
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Hetherly, J.; Martinez, E.; Di, Z.F.; Nastasi, M.; Caro, A. |
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Helium bubble precipitation at dislocation networks |
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Journal Article |
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2011 |
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Scripta Materialia |
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In Press |
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Uncorrected Proof |
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Modeling; Precipitation; Grain boundary structure; He bubbles |
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We report on a study of nanoscale He bubble precipitation and growth at a twist grain boundary in two face-centered cubic materials. Experimentally, the twist boundary in Au captures all the He in the sample, forming equal-sized bubbles at the dislocation intersection junctions. Simulations in Cu reveal a complex structure of the interface and different He pressure in the interface bubbles compared to bulk, providing an explanation for the high efficiency of the boundary to capture all the He in the sample. |
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1359-6462 |
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NU @ karnesky @ |
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11267 |
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D J Larson and D Lawrence and W Lefebvre and D Olson and T J Prosa and D A Reinhard and R M Ulfig and P H Clifton and J H Bunton and D Lenz and J D Olson and L Renaud and I Martin and T F Kelly |
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Toward atom probe tomography of microelectronic devices |
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Journal Article |
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2011 |
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Journal of Physics: Conference Series |
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326 |
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1 |
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012030 |
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Atom probe tomography and scanning transmission electron microscopy has been used to analyze a commercial microelectronics device prepared by depackaging and focused ion beam milling. Chemical and morphological data are presented from the source, drain and channel regions, and part of the gate oxide region of an Intel ® i5-650 p-FET device demonstrating feasibility in using these techniques to investigate commercial chips. |
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1742-6596 |
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NU @ karnesky @ |
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11288 |
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Mao, Zugang; Booth-Morrison, Christopher; Sudbrack, Chantal K.; Martin, Georges; Seidman, David N. |
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Kinetic pathways for phase separation: An atomic-scale study in Ni–Al–Cr alloys |
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2011 |
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Acta Materialia |
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60 |
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1871-1888 |
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Nickel-based superalloys; Kinetic pathways; Atom probe tomography; Lattice kinetic Monte Carlo; Nanostructures |
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The kinetic pathways involved in the formation of [gamma]'(L12 structure)-precipitates during aging of concentrated Ni–Al–Cr alloys at 873 K, for three distinct alloy compositions, are studied experimentally by atom probe tomography, and computationally with lattice kinetic Monte Carlo (LKMC) simulations using parameters deduced from first-principles calculations of cohesive energies, and from experimental diffusion data. It is found that the compositional evolution of the [gamma]'-precipitate phase does not follow the predictions of a classical mean-field model for coarsening of precipitates in ternary alloys. LKMC simulations reveal that long-range vacancy–solute binding plays a key role during the early stages of [gamma]'-precipitation. With the aid of Monte Carlo techniques using the parameters employed in the LKMC simulations, we compute the diffusion matrix in the terminal solid-solutions and demonstrate that key features of the observed kinetic pathways are the result of kinetic couplings among the diffusional fluxes. The latter are controlled by the long-range vacancy–solute binding energies. It is concluded that, because it neglects flux couplings, the classical mean-field approach to phase separation for a ternary alloy, despite its many qualitatively correct predictions, fails to describe quantitatively the true kinetic pathways that lead to phase separation in concentrated metallic alloys. |
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1359-6454 |
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NU @ karnesky @ |
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11306 |
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Martin, M.L.; Somerday, B.P.; Ritchie, R.O.; Sofronis, P.; Robertson, I.M. |
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Hydrogen-induced intergranular failure in nickel revisited |
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Journal Article |
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2012 |
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Acta Materialia |
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In Press |
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Corrected Proof |
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Hydrogen embrittlement; Intergranular cracking; Transmission electron microscopy; Scanning electron microscopy; Nickel |
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Using a combination of high-resolution scanning and transmission electron microscopy, the basic mechanisms of hydrogen-induced intergranular fracture in nickel have been revisited. Focused-ion beam machining was employed to extract samples from the fracture surface to enable the examination of the microstructure immediately beneath it. Evidence for slip on multiple slip systems was evident on the fracture surface; immediately beneath it, an extensive dislocation substructure exists. These observations raise interesting questions about the role of plasticity in establishing the conditions for hydrogen-induced crack initiation and propagation along a grain boundary. The mechanisms of hydrogen embrittlement are re-examined in light of these new results. |
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1359-6454 |
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NU @ karnesky @ |
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11313 |
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Stone, D.S.; Gao, H.; Chantharangsi, C.; Paksunchai, C.; Bischof, M.; Jaeger, D.; Martini, A.; Scharf, T.W.; Aouadi, S.M. |
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Load-dependent high temperature tribological properties of silver tantalate coatings |
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Journal Article |
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2014 |
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Surface and Coatings Technology |
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244 |
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37-44 |
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Friction; Tribology; Silver tantalate; Molecular dynamics; Sputtering |
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Abstract Silver tantalate coatings were produced by reactive unbalanced magnetron sputtering from silver and tantalum sources as potential high temperature solid lubricants. The films were wear-tested at 750 °C under normal loads of 1, 2, 5, or 10 N against a Si3N4 counterface. These sliding tests revealed that the friction monotonically increased as the load was increased. A systematic investigation of the surface and sub-surface regions of the wear track, using techniques such as Scanning Auger Nanoprobe, Atom Probe Tomography, and cross-sectional transmission electron microscopy, revealed the following trends with increasing load: (1) a decrease in the amount of Ag on the surface of the wear track; (2) a decrease in the thickness of the mechanically mixed layer that forms as a result of the reconstruction of AgTaO3 to form Ta2O5 and Ag; and (3) the formation of a porous structure throughout the tribofilm as a result of the segregation and migration of Ag from the original AgTaO3 matrix. These results were complemented by molecular dynamics simulations, which confirmed the increase of friction with load. Further, the simulations support the hypothesis that this trend can be explained in terms of decreased presence of Ag clusters near the sliding surface and the associated decreased porosity. |
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0257-8972 |
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NU @ karnesky @ |
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11490 |
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Georges Martin |
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Resumee Georges Martin |
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Miscellaneous |
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2019 |
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Georges Martin |
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CV Georges Martin |
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NU @ z-mao2 @ |
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11558 |
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