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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Wokaun, A.
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Topics
Publications (18/18 displayed)
- 2012Relevance and formation mechanisms of negative ions upon ablation of Al 2O 3citations
- 2011Progress in in situ X-ray tomographic microscopy of liquid water in gas diffusion layers of PEFCcitations
- 2011Nanosecond and femtosecond ablation of La0.6Ca0.4CoO3: a comparison between plume dynamics and composition of the filmscitations
- 2011Pulsed laser deposition and characterisation of perovskite-type LaTiO 3− x N x thin filmscitations
- 2010Laser ablation characteristics of yttria-doped zirconia in the nanosecond and femtosecond regimescitations
- 2009Pulsed laser deposition and characterization of nitrogen-substituted SrTiO 3 thin filmscitations
- 2009Mechanisms of the laser plume expansion during the ablation of LiMn2O4citations
- 2009Mechanisms of the laser plume expansion during the ablation of LiMn 2 O 4citations
- 2008Influence of thermal diffusion on the laser ablation of thin polymer filmscitations
- 2008RF-plasma assisted pulsed laser deposition of nitrogen-doped SrTiO 3 thin filmscitations
- 2007Femtosecond and nanosecond laser damage thresholds of doped and undoped triazenepolymer thin filmscitations
- 2007Perovskite thin films deposited by pulsed laser ablation as model systems for electrochemical applicationscitations
- 2007Incubation behaviour in triazenepolymer thin films upon near-infrared femtosecond laser pulse irradiationcitations
- 2007Preparation of epitaxial La 0.6 Ca 0.4 Mn 1- x Fe x O 3 ( x = 0, 0.2) thin films: variation of the oxygen contentcitations
- 2007Preparation of epitaxial La0.6Ca0.4Mn1-xFexO3 (x=0, 0.2) thin films: Variation of the oxygen contentcitations
- 2006Structural characterization and magnetoresistance of manganates thin films and Fe-doped manganates thin filmscitations
- 2006Excimer laser forward transfer of mammalian cells using a novel triazene absorbing layercitations
- 2005Can thin perovskite film materials be applied as model systems for battery applications?citations
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article
Mechanisms of the laser plume expansion during the ablation of LiMn2O4
Abstract
Films of LiMn2O4 prepared by pulsed laser ablation deposition are typically lithium deficient when grown at background pressures ranging between 10(-4) and 20 Pa. The deficiency of light atomic species such as lithium in LiMn2O4 thin films occurs as a result of the different behavior of the species during plume expansion and the deposition of the film at elevated deposition temperatures. The plasma plume evolution in vacuum and 20 Pa oxygen pressure are studied using two spectroscopic techniques: emission spectroscopy and plume imaging. Higher velocities and a wider spatial distribution of lithium atoms are observed in vacuum when compared with manganese and oxygen species. Plume species are slowed down due to collisions with gas molecules when ablating LiMn2O4 in an oxygen atmosphere. As a result, a strong deceleration of the plasma front occurs, and the effect is more pronounced for the light species, e.g., Li. Comparing the spatial manganese and lithium distribution within the plasma, the lithium species are again scattered into a wider angular range. These similar spatial distributions of Li atoms detected in the pressure range between 10(-4) and 20 Pa suggest that it is not possible to achieve a congruent lithium transfer to a growing film if the target contains heavier elements besides lithium. The general implications for the ablation of materials containing a combination of light and heavy elements are that as-grown films are inherently deficient with respect to the content of the light elements. If the mass ratio between the light and the heavy elements is not too different, is should be possible to find a set of deposition parameters which will result in the growth of a film with the desired composition.