Single-phase high entropy fluorite (Ce0.2Zr0.2Y0.2Gd0.2La0.2O2 δ) samples were synthesized by co-precipitation and consolidated by ultrafast high-temperature sintering (UHS) in less than 2 min. The chemical homogeneity of the sintered materials was confirmed by X-Ray Diffraction (XRD), Energy Dispersive X-ray Spectroscopy (EDXS), high-resolution EDXS using Transmission Electron Microscopy (TEM), and Raman spectroscopy. Compared to conventional sintering, UHS of high entropy ceramics was a hundred times faster and it resulted in highly dense microstructures (relative density > 93%) with nanometric grains. Ce0.2Zr0.2Y0.2Gd0.2La0.2O2 δ densified under an UHS current of 20–25 A. An optimized step-wise UHS schedule was proposed to obtain dense, single-phase pellets with a reduced amount of defects. The extreme heating rates were found beneficial to limit grain coarsening and to obtain a single phase.

Ultra-fast high-temperature sintering (UHS) of Ce0.2Zr0.2Y0.2Gd0.2La0.2O2-δ fluorite-structured entropy-stabilized oxide (F-ESO) / Spiridigliozzi, Luca; Dell'Agli, Gianfranco; Esposito, Serena; Rivolo, Paola; Grasso, Salvatore; Sglavo, Vincenzo M.; Biesuz, Mattia. - In: SCRIPTA MATERIALIA. - ISSN 1359-6462. - ELETTRONICO. - 214:(2022), p. 114655. [10.1016/j.scriptamat.2022.114655]

Ultra-fast high-temperature sintering (UHS) of Ce0.2Zr0.2Y0.2Gd0.2La0.2O2-δ fluorite-structured entropy-stabilized oxide (F-ESO)

Serena Esposito;Paola Rivolo;Salvatore Grasso;Vincenzo M. Sglavo;
2022

Abstract

Single-phase high entropy fluorite (Ce0.2Zr0.2Y0.2Gd0.2La0.2O2 δ) samples were synthesized by co-precipitation and consolidated by ultrafast high-temperature sintering (UHS) in less than 2 min. The chemical homogeneity of the sintered materials was confirmed by X-Ray Diffraction (XRD), Energy Dispersive X-ray Spectroscopy (EDXS), high-resolution EDXS using Transmission Electron Microscopy (TEM), and Raman spectroscopy. Compared to conventional sintering, UHS of high entropy ceramics was a hundred times faster and it resulted in highly dense microstructures (relative density > 93%) with nanometric grains. Ce0.2Zr0.2Y0.2Gd0.2La0.2O2 δ densified under an UHS current of 20–25 A. An optimized step-wise UHS schedule was proposed to obtain dense, single-phase pellets with a reduced amount of defects. The extreme heating rates were found beneficial to limit grain coarsening and to obtain a single phase.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2957998