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From design to characterization of zirconium nitride/silicon nitride nanocomposites

Abstract : ZrN/Si3N4 nanocomposites have been prepared by chemically crosslinking two polysilazanes with a zirconium-based compound and subsequent heat-treatment at temperatures ranging from 1000 to 1600 °C. The polymer synthesis has been systematically investigated using FT-IR, solid-state NMR, and elemental analyses. Then, the pyrolysis under ammonia at 1000 °C trigering the thermo-chemical polymer-to-ceramic conversion was examined, leading to X-ray amorphous ceramics with yields governed by the chemistry of the neat polysilazane. Investigations of the structural evolution of the single-phase amorphous ceramic network above 1000 °C by X-ray diffraction and Raman spectroscopy pointed out that the ZrN phase already segregated at 1400 °C and formed highly crystalline ZrN/Si3N4 nanocomposites at 1600 °C. HRTEM investigations validated the unique nanostructural feature of the nanocomposites made of ZrN nanocrystals distributed in α- and β-Si3N4 phases. Our preliminary investigations of the optical properties showed that these structural changes allowed tuning the optical properties of ZrN/Si3N4 nanocomposites.
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Submitted on : Friday, May 6, 2022 - 2:15:29 PM
Last modification on : Saturday, October 1, 2022 - 3:57:02 AM
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Mirna Chaker Bechelany, Vanessa Proust, Abhijeet Lale, Maxime Balestrat, Arnaud Brioude, et al.. From design to characterization of zirconium nitride/silicon nitride nanocomposites. Journal of the European Ceramic Society, Elsevier, 2022, 42 (5), pp.2135-2145. ⟨10.1016/j.jeurceramsoc.2022.01.007⟩. ⟨hal-03660916⟩



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