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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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Florian, Pierre
Conditions Extrêmes et Matériaux Haute Température et Irradiation
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Topics
Publications (15/15 displayed)
- 2024Structure and properties of gallate and germanate langasite infrared optical glass materialscitations
- 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
- 2023A robust ultra-microporous cationic aluminum-based metal-organic framework with a flexible tetra-carboxylate linkercitations
- 2023A Robust Ultra-microporous Cationic Aluminiumbased Metal-Organic Framework with a Flexible Tetra-carboxylate Linkercitations
- 2022Structure and related properties of amorphous magnesium aluminosilicatescitations
- 2022Structure and related properties of amorphous magnesium aluminosilicatescitations
- 2021Beyond surface nanoindentation: Combining static and dynamic nanoindentation to assess intrinsic mechanical properties of chemical vapor deposition amorphous silicon oxide (SiOx) and silicon oxycarbide (SiOxCy) thin filmscitations
- 201717 O NMR evidence of free ionic clusters Mn+ CO3 2− in silicate glasses: Precursors for carbonate-silicate liquids immiscibilitycitations
- 2016Modifier cation effects on 29Si nuclear shielding anisotropies in silicate glassescitations
- 2015Calcium environment in silicate and aluminosilicate glasses Probed by 43Ca MQMAS NMR Experiments and MD-GIPAW calculationscitations
- 2015Calcium environment in silicate and aluminosilicate glasses Probed by $^{43}$Ca MQMAS NMR experiments and MD-GIPAW calculationscitations
- 2014Temperature Dependent 4-, 5- and 6-Fold Coordination of Aluminum in MOCVD-Grown Amorphous Alumina Films: From Local Coordination to Material Propertiescitations
- 2013Phase Separation and Spatial Morphology in Sodium Silicate Glasses by AFM, Light Scattering and NMRcitations
- 2013Temperature-Dependent 4‑, 5- and 6‑Fold Coordination of Aluminum in MOCVD-Grown Amorphous Alumina Films: A Very High Field 27Al-NMR studycitations
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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.