Migration and annihilation of non-equilibrium point defects in sputter deposited nanocrystalline alpha-Fe films

Chakravarty, S.; Miao, Jibin; Tietze, U.; Lott, D.; Geue, Thomas; Stahn, J.; Schmidt, Harald

doi:10.1016/j.actamat.2011.05.029

Cited by 22 publications

(9 citation statements)

References 27 publications

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“…In these materials, however, the initial dislocation density appeared very low. Sputtering has also been shown to result in relatively high vacancy concentrations [38] but it is expected that this effect will provide only a minor contribution as it has been shown that a vacancy can trap only up to two carbon atoms in BCC iron [39].…”

Section: Discussionmentioning

confidence: 99%

Supersaturated α-iron in vapour-deposited Fe–C thin films

Weck

Sinclair

Scott³

et al. 2012

J Mater Sci

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While the conventional Fe-C phase diagram predicts negligible solubility of carbon in a-Fe at room temperature, there are many examples where substantial carbon supersaturations have been reported. Non-equilibrium processing routes, such as physical vapour deposition (PVD), appear to be particularly well suited to generating very high levels of supersaturation. Few descriptions of the stability and microstructure of the supersaturated state exist, however. In this study, experiments have been performed using two PVD techniques allowing for the production of nanocrystalline films containing between 11 and 16 at% C. Transmission electron microscopy and electron energy loss spectroscopy reveal no phase other than a nearly body-centred cubic iron in the as-deposited films. This result is discussed with respect to the kinetics of carbon rearrangement and the possibility of the stabilization of the supersaturated state via defects.

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Section: Discussionmentioning

confidence: 99%

Supersaturated α-iron in vapour-deposited Fe–C thin films

Weck

Sinclair

Scott³

et al. 2012

J Mater Sci

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“…Literature work is mainly on the investigation of selfdiffusion in thin metallic, semiconducting and ceramic films in form of isotope multilayers [1,[22][23][24][25][26]. One of the main achievements of the present work was to implement an improvement of the classical multilayer technique [27,28], where self-diffusion in bulk materials was measured by NR for the first time and to transfer the method to the application to lithium.…”

Section: Introductionmentioning

confidence: 99%

Slow Lithium Transport in Metal Oxides on the Nanoscale

Uhlendorf

Ruprecht

Witt

et al. 2017

Zeitschrift Für Physikalische Chemie

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This article reports on Li self-diffusion in lithium containing metal oxide compounds. Case studies on LiNbO 3 , Li 3 NbO 4 , LiTaO 3 , LiAlO 2 , and LiGaO 2 are presented. The focus is on slow diffusion processes on the nanometer scale investigated by macroscopic tracer methods (secondary ion mass spectrometry, neutron reflectometry) and microscopic methods (nuclear magnetic resonance spectroscopy, conductivity spectroscopy) in comparison. Special focus is on the influence of structural disorder on diffusion.

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“…The time-dependence of the self-diffusivities found by analysis of the experimental data can be explained with the fact that a defect annihilation process is taking place during isothermal annealing 29 , 55 . In general, during self-diffusion in solids a point defect-atom exchange takes place while D = f D c D D D , assuming a single dominating defect governing diffusion.…”

Section: Resultsmentioning

confidence: 88%

In-situ Measurement of Self-Atom Diffusion in Solids Using Amorphous Germanium as a Model System

Hüger

Strauß

Stahn

et al. 2018

Sci Rep

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We present in-situ self-diffusion experiments in solids, which were carried out by Focussing Neutron Reflectometry on isotope multilayers. This new approach offers the following advantages in comparison to classical ex-situ measurements: (1) Identification and continuous measurement of a time dependence of diffusivities, (2) significant reduction of error limits of diffusivities, and (3) substantial reduction of the necessary experimental time. In the framework of a case study, yet unknown self-diffusivities in amorphous germanium are measured at various temperatures quasi-continuously, each during isothermal annealing. A significant decrease of diffusivities as a function of annealing time by one order of magnitude is detected that is attributed to structural relaxation accompanied by defect annihilation. In metastable equilibrium the diffusivities follow the Arrhenius law between 375 and 412 °C with an activation energy of Q = (2.11 ± 0.12) eV. The diffusivities are five orders of magnitude higher than in germanium single crystals at 400 °C, mainly due to the lower activation energy.

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Migration and annihilation of non-equilibrium point defects in sputter deposited nanocrystalline alpha-Fe films

Cited by 22 publications

References 27 publications

Supersaturated α-iron in vapour-deposited Fe–C thin films

Supersaturated α-iron in vapour-deposited Fe–C thin films

Slow Lithium Transport in Metal Oxides on the Nanoscale

In-situ Measurement of Self-Atom Diffusion in Solids Using Amorphous Germanium as a Model System

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