Diffusion of 6Li in Tantalum and Tungsten Studied by the Neutron Depth Profiling Technique

2005 ◽  
Vol 237-240 ◽  
pp. 485-490 ◽  
Author(s):  
J. Vacik ◽  
Uwe Köster ◽  
V. Hnatowicz ◽  
J. Cervena ◽  
G. Pasold
Keyword(s):  
Surface Layer ◽  
Diffusion Process ◽  
Computer Simulations ◽  
Depth Profiling ◽  
Sample Surface ◽  
Fickian Diffusion ◽  
Radiation Defects ◽  
Complex Behavior ◽  
Neutron Depth Profiling ◽  
Preliminary Results

Diffusion of 6Li in the refractory metals Ta and W has been studied using the nondestructive neutron depth profiling technique. The preliminary results point out the complex behavior of 6Li atoms in W and Ta. The experiment showed that the Fickian diffusion is affected by the presence of traps and radiation defects in the sample surface layer. Further experiments and computer simulations of the diffusion process are in progress.

Glass Surface Layer Density by Neutron Depth Profiling

2012 ◽  
Vol 3 (2) ◽  
pp. 137-143 ◽  
Author(s):  
Cory L. Trivelpiece ◽  
John J. Petrunis ◽  
Carlo G. Pantano ◽  
R. Gregory Downing
Keyword(s):  
Surface Layer ◽  
Glass Surface ◽  
Depth Profiling ◽  
Neutron Depth Profiling ◽  
Layer Density

Non-Standard Fickian Self-Diffusion of Isotopically Pure Boron Observed by Neutron Reflectometry and Depth Profiling

1994 ◽  
Vol 376 ◽  
Author(s):  
Shenda M. Baker ◽  
K. Wu ◽  
G. S. Smith ◽  
K. M. Hubbard ◽  
M. Nastasi ◽  
...  
Keyword(s):  
Standard Form ◽  
Diffusion Constant ◽  
Depth Profiling ◽  
Step Function ◽  
Neutron Reflectometry ◽  
Fickian Diffusion ◽  
Neutron Depth Profiling ◽  
Self Diffusion ◽  
Fixed Composition ◽  
Comparison Of The Results

ABSTRACTNeutron reflectometry (NR) studies1 of thin films of amorphous 11B/l0B on silicon indicate that a non-standard form of Fickian diffusion occurs across the boron interface upon annealing. In order to verify this observation, the samples were examined by neutron depth profiling (NDP). Comparison of the results from models of a step function, standard Fickian diffusion and Fickian diffusion with a fixed composition at the interface were made and compared to the previous NR results. The diffusion constant resulting from the non-standard Fickian model for the NDP data differs slightly from that obtained from the commonly used Fickian diffusion model and is not inconsistent with the NR results. This finding suggests that more information regarding diffusion at interfaces can be gained from these higher resolution neutron scattering techniques.

Distribution of Boron Atoms in Ion Implanted Compound Semiconductors

1988 ◽  
Vol 126 ◽  
Author(s):  
R. C. Bowman ◽  
J. F. Knudsen ◽  
R. G. Downing ◽  
R. E. Kremer
Keyword(s):  
Monte Carlo ◽  
Computer Simulations ◽  
Depth Profiling ◽  
Compound Semiconductors ◽  
Neutron Depth Profiling ◽  
Annealing Conditions ◽  
Ion Ranges ◽  
Good Agreement ◽  
Ion Implanted

ABSTRACTThe nondestructive neutron depth profiling (NDP) technique has been used to measure the boron (10B) distributions in GaAs, CdTe, Hg0.7 Cd0.3 Te, and Hg0.85 Mn0.15Te after multiple energy ion implants. The NDP results are found to be in good agreement with the theoretical ion ranges obtained from Monte Carlo computer simulations. Only minor changes in the boron profiles were seen for the chosen annealing conditions.

Measurement of Li diffusion in porous carbon by neutron depth profiling

2018 ◽  
Vol 173 (9-10) ◽  
pp. 836-841 ◽  
Author(s):  
G. Ceccio ◽  
A. Cannavò ◽  
P. Horak ◽  
A. Torrisi ◽  
I. Tomandl ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Depth Profiling ◽  
Neutron Depth Profiling

scholarly journals Study of Resistance to Helium Swelling of Lithium-Containing Ceramics under High-Temperature Irradiation

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1350
Author(s):  
Dmitriy I. Shlimas ◽  
Artem L. Kozlovskiy ◽  
Askar Kh. Syzdykov ◽  
Daryn B. Borgekov ◽  
Maxim V. Zdorovets
Keyword(s):  
Surface Layer ◽  
High Temperature ◽  
Radiation Damage ◽  
Thermal Annealing ◽  
Reactor Core ◽  
Strength Properties ◽  
Radiation Defects ◽  
Temperature Irradiation ◽  
Thermal Sintering ◽  
Damage Processes

The aim of this work was to study resistance to helium accumulation processes in the structure of the surface layer of lithium-containing ceramics and the subsequent destruction and embrittlement processes, depending on radiation fluence. The objects of study were Li2TiO3-type ceramics obtained by thermal sintering. The fluence dependency of changes in the structural and strength properties of ceramics was determined to be in the range from 1018 to 1022 ion/m2, which corresponded to the concentration of implanted helium from 0.01% to 0.8–1 at.%. Irradiation was carried out at a temperature of 700 °C, which made it possible to simulate the processes of radiation damage that were closest to the real conditions in the reactor core. During the studies carried out, it was found that, at irradiation fluences of 1018–1020 ion/m2, the formation of point radiation defects was equaled by the process of thermal annealing of defects, as a result of which the concentration of defects and their effect on the change in the structural and strength properties of ceramics were insignificant. An increase in the concentration of implanted helium in the structure of the surface layer to above 0.5 at.% led to the dominance of radiation damage processes over the annealing of defects and the formation of gas-filled cavities, which negatively affects the strength of ceramics.

scholarly journals Structural Aspects of Remelting of the AZ91 Magnesium Alloy Surface Layer

2016 ◽  
Vol 16 (1) ◽  
pp. 13-18
Author(s):  
J. Iwaszko ◽  
M. Strzelecka
Keyword(s):  
Surface Layer ◽  
Magnesium Alloy ◽  
Structural Changes ◽  
Continuous Wave ◽  
Sample Surface ◽  
Alloy Surface ◽  
Az91 Alloy ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium ◽  
Alloy Surface Layer

Abstract In this study, modification of the AZ91 magnesium alloy surface layer with a CO2 continuous wave operation laser has been taken on. The extent and character of structural changes generated in the surface layer of the material was being assessed on the basis of both macro- and microscopy investigations, and the EDX analysis. Considerable changes in the structure of the AZ91 alloy surface layer and the morphology of phases have been found. The remelting processing was accompanied by a strong refinement of the structure and a more uniform distribution of individual phases. The conducted investigations showed that the remelting zone dimensions are a result of the process parameters, and that they can be controlled by an appropriate combination of basic remelting parameters, i.e. the laser power, the distance from the sample surface, and the scanning rate. The investigations and the obtained results revealed the possibility of an effective modification of the AZ91 magnesium alloy surface layer in the process of remelting carried out with a CO2 laser beam.

Considerations in Applying Neutron Depth Profiling (NDP) to Li-Ion Battery Research

2022 ◽  
Author(s):  
Daniel J. Lyons ◽  
Jamie L. Weaver ◽  
Anne C. Co
Keyword(s):  
Electrode Materials ◽  
Depth Profiling ◽  
Li Ion Battery ◽  
Neutron Depth Profiling ◽  
Battery Electrode ◽  
Li Ion

Li distribution within micron-scale battery electrode materials is quantified with neutron depth profiling (NDP). This method allows the determination of intra- and inter-electrode parameters such as lithiation efficiency, electrode morphology...

Physical model of neutron depth profiling in common conditions

2013 ◽  
Vol 25 (5) ◽  
pp. 1279-1282
Author(s):  
窦海峰 Dou Haifeng ◽  
李润东 Li Rundong ◽  
徐家云 Xu Jiayun ◽  
袁姝 Yuan Shu ◽  
唐凤平 Tang Fengping
Keyword(s):  
Physical Model ◽  
Depth Profiling ◽  
Neutron Depth Profiling
Sign in / Sign up

Export Citation Format

Share Document