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Ceramic nanocomposites prepared via the in situ formation of a novel TiZrN2 nanophase in a polymer-derived Si3N4 matrix

Abstract : The first demonstration of a nanoscaled titanium zirconium nitride (TiZrN2) single-phase isolated during the preparation of polymer-derived silicon nitride (Si3N4) matrix nanocomposites is discussed. We employed a polysilazane, which was chemically modified with Zr[N(CH2CH3)2]4 and Ti[N(CH3)2]4 then ammonolyzed before a pyrolysis step under ammonia (1000 °C) and a heat-treatment in flowing nitrogen (1000–1700 °C). Based on a careful control of the precursor chemistry in the early stage of the process and nano-/microstructural investigations of the material performed during its preparation, we were able to identify TiZrN2 nanocrystals with a size as low as 9 nm distributed in α- and β-Si3N4 phases at a temperature as low as 1500 °C. We particularly proved that the TiZrN2 nanophase could be generated because of the use of the polysilazane evoluting towards a covalently-bonded Si3N4 matrix . This unique nanostructure is expected to provide particular functionality to Si3N4 as noble metal-free catalysts and components with high plasmonic quality.
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https://hal-cnrs.archives-ouvertes.fr/hal-03660914
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Submitted on : Friday, May 6, 2022 - 2:07:52 PM
Last modification on : Monday, May 9, 2022 - 9:31:55 AM

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Mirna Chaker Bechelany, Abhijeet Lale, Maxime Balestrat, Christel Gervais, Sylvie Malo, et al.. Ceramic nanocomposites prepared via the in situ formation of a novel TiZrN2 nanophase in a polymer-derived Si3N4 matrix. Journal of the European Ceramic Society, Elsevier, 2022, 42 (10), pp.4172-4178. ⟨10.1016/j.jeurceramsoc.2022.04.006⟩. ⟨hal-03660914⟩

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