Analyses of thick lithium coatings deposited by sputter-evaporation and exposed to air

Christophe Rigaux, F. Bodart, A. Lafort, Y. Jongen, A. Cambriani, S. Lucas

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

Lithium coatings on various substrates have numerous applications: Boron neutron capture therapy, neutron activation analysis, super-conducting tokamak etc. Traditionally these coatings are produced by well-known techniques such as electrochemistry and evaporation. In this work, we investigated a new method based on sputter-evaporation, which enables thick coatings (>10 μm) to be built on various substrates within a short timeframe. In order to minimize the process time, evaporation techniques can be used but the coating quality suffers. Moreover, it is well known that the use of DC magnetron sputtering results in the deposition of good quality coatings (smoothness, density, adhesion); however, the deposition rate is low. The rationale of this work is to combine these two techniques, yielding a sputter-evaporation process that possesses the advantages of each separate technique. Li is placed in a stainless steel crucible (cathode), and heated by the plasma generated by a magnetron discharge. The Li temperature is measured by a thermocouple welded onto the cathode and measured at different plasma power densities. The deposition rate of lithium is measured using a quartz balance and by profilometry, at several temperatures (from 0 to 580 °C). Li samples were depthprofiled with the resonant nuclear reaction Li(p,γ) . In addition to the concentration, certain characteristics like the density and the chemical reactivity of layers, are also important. Thus we have studied the evolution of the density with time, estimated by weight and profilometry measurements, and the change in morphology, by cross-sectional scanning electron microscopy (SEM), of samples exposed to air at room temperature. The evolution of the film compounds have also been determined by X-ray powder diffraction. These physical properties have been investigated for various bias substrates during deposition.
langue originaleAnglais
journalPlasma Processes and Polymers
Volume6
Numéro de publicationSUPPL. 1
Les DOIs
étatPublié - 1 janv. 2009

Empreinte digitale

Lithium
Evaporation
lithium
evaporation
coatings
Coatings
air
Air
Profilometry
Deposition rates
Cathodes
Substrates
cathodes
weight measurement
Plasmas
Chemical reactivity
neutron activation analysis
Quartz
Boron
Neutron activation analysis

Citer ceci

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abstract = "Lithium coatings on various substrates have numerous applications: Boron neutron capture therapy, neutron activation analysis, super-conducting tokamak etc. Traditionally these coatings are produced by well-known techniques such as electrochemistry and evaporation. In this work, we investigated a new method based on sputter-evaporation, which enables thick coatings (>10 μm) to be built on various substrates within a short timeframe. In order to minimize the process time, evaporation techniques can be used but the coating quality suffers. Moreover, it is well known that the use of DC magnetron sputtering results in the deposition of good quality coatings (smoothness, density, adhesion); however, the deposition rate is low. The rationale of this work is to combine these two techniques, yielding a sputter-evaporation process that possesses the advantages of each separate technique. Li is placed in a stainless steel crucible (cathode), and heated by the plasma generated by a magnetron discharge. The Li temperature is measured by a thermocouple welded onto the cathode and measured at different plasma power densities. The deposition rate of lithium is measured using a quartz balance and by profilometry, at several temperatures (from 0 to 580 °C). Li samples were depthprofiled with the resonant nuclear reaction Li(p,γ) . In addition to the concentration, certain characteristics like the density and the chemical reactivity of layers, are also important. Thus we have studied the evolution of the density with time, estimated by weight and profilometry measurements, and the change in morphology, by cross-sectional scanning electron microscopy (SEM), of samples exposed to air at room temperature. The evolution of the film compounds have also been determined by X-ray powder diffraction. These physical properties have been investigated for various bias substrates during deposition.",
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Analyses of thick lithium coatings deposited by sputter-evaporation and exposed to air. / Rigaux, Christophe; Bodart, F.; Lafort, A.; Jongen, Y.; Cambriani, A.; Lucas, S.

Dans: Plasma Processes and Polymers , Vol 6, Numéro SUPPL. 1, 01.01.2009.

Résultats de recherche: Contribution à un journal/une revueArticle

TY - JOUR

T1 - Analyses of thick lithium coatings deposited by sputter-evaporation and exposed to air

AU - Rigaux, Christophe

AU - Bodart, F.

AU - Lafort, A.

AU - Jongen, Y.

AU - Cambriani, A.

AU - Lucas, S.

PY - 2009/1/1

Y1 - 2009/1/1

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AB - Lithium coatings on various substrates have numerous applications: Boron neutron capture therapy, neutron activation analysis, super-conducting tokamak etc. Traditionally these coatings are produced by well-known techniques such as electrochemistry and evaporation. In this work, we investigated a new method based on sputter-evaporation, which enables thick coatings (>10 μm) to be built on various substrates within a short timeframe. In order to minimize the process time, evaporation techniques can be used but the coating quality suffers. Moreover, it is well known that the use of DC magnetron sputtering results in the deposition of good quality coatings (smoothness, density, adhesion); however, the deposition rate is low. The rationale of this work is to combine these two techniques, yielding a sputter-evaporation process that possesses the advantages of each separate technique. Li is placed in a stainless steel crucible (cathode), and heated by the plasma generated by a magnetron discharge. The Li temperature is measured by a thermocouple welded onto the cathode and measured at different plasma power densities. The deposition rate of lithium is measured using a quartz balance and by profilometry, at several temperatures (from 0 to 580 °C). Li samples were depthprofiled with the resonant nuclear reaction Li(p,γ) . In addition to the concentration, certain characteristics like the density and the chemical reactivity of layers, are also important. Thus we have studied the evolution of the density with time, estimated by weight and profilometry measurements, and the change in morphology, by cross-sectional scanning electron microscopy (SEM), of samples exposed to air at room temperature. The evolution of the film compounds have also been determined by X-ray powder diffraction. These physical properties have been investigated for various bias substrates during deposition.

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