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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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Sarou-Kanian, Vincent
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Topics
Publications (11/11 displayed)
- 2024Crystallization Mechanisms in New Bismuth Borotellurite Glass-Ceramicscitations
- 2023Operando nuclear magnetic resonance spectroscopy: Detection of the onset of metallic lithium deposition on graphite at low temperature and fast charge in a full Li-ion batterycitations
- 2023Resolved-detrimental langasite-type surface crystallization in yttrium lanthanum gallium-rich heavy metal oxide glasses for infra-red optical fiber applications
- 2023Resolved‐detrimental surface crystallization in yttrium lanthanum gallate glasses for optical fiber applicationscitations
- 2020A comprehensive study of the glass/translucent anti-glass/transparent ceramic structural ordering in the Bi2O3Nb2O5–TeO2 systemcitations
- 2020La2Ga3O7.5: a metastable ternary melilite with a super-excess of inter- stitial oxide ions synthesized by direct crystallization of the meltcitations
- 2019Deconvolution method of $^{29}$Si MAS NMR spectra applied to homogeneous and phase separated lanthanum aluminosilicate glassescitations
- 2019Highly Transparent Fluorotellurite Glass-Ceramics: Structural Investigations and Luminescence Propertiescitations
- 2014Temperature Dependent 4-, 5- and 6-Fold Coordination of Aluminum in MOCVD-Grown Amorphous Alumina Films: From Local Coordination to Material Propertiescitations
- 2013Temperature-Dependent 4‑, 5- and 6‑Fold Coordination of Aluminum in MOCVD-Grown Amorphous Alumina Films: A Very High Field 27Al-NMR studycitations
- 2003Experimental study of the aluminum droplet combustion under forced convection. Influence of the gaseous atmosphere
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article
Temperature Dependent 4-, 5- and 6-Fold Coordination of Aluminum in MOCVD-Grown Amorphous Alumina Films: From Local Coordination to Material Properties
Abstract
International audience ; Aluminum 5-fold coordination coexisting with 4-and 6-fold coordination structurally characterizes amorphous aluminum oxide. For nearly 30 years now, 27Al MAS NMR has enabled to detect and later on to quantify this feature thanks to advances in high-resolution instrumentation. The Introduction shortly reviews the results of investigations of 5-coordinate aluminum in amorphous alumina through NMR analysis. Aluminum oxide is not a glass-forming oxide. A convenient way to obtain the amorphous state is by thin film deposition. We present here 27Al NMR analysis of a series of thin films of aluminum oxide prepared by metalorganic chemical vapor deposition (MOCVD) in the temperature range 360 ≤ Td ≤ 720 °C. In this range, low Td yield OH-containing films, while high Td yield nanocrystallites-containing films. The variation of the [4]Al, [5]Al and [6]Al content with Td is presented and discussed. It is correlated with the Td dependence of mechanical and corrosion protection properties. These properties are optimal when the structural disorder is to the utmost. Al coordination dependence on film thickness and the formation of metallic aluminum during the deposition process are also presented.