Hudelja, PolonaSchmidt, RainerAmorín, HarveyDrev, SandraIvekovic, AljazAbram, AnzeKocjan, AndrazWicklein, Bernd2024-01-182024-01-182022-04-25Polona Hudelja, Rainer Schmidt, Harvey Amorín, Sandra Drev, Aljaž Iveković, Anže Abram, Andraž Kocjan, Bernd Wicklein, Microstructure-property relationships in composites of 8YSZ ceramics and in situ graphitized nanocellulose, Journal of the European Ceramic Society, Volume 42, Issue 11, 2022, Pages 4594-4606, ISSN 0955-2219, https://doi.org/10.1016/j.jeurceramsoc.2022.04.041.0955-221910.1016/j.jeurceramsoc.2022.04.041https://hdl.handle.net/20.500.14352/93767Se deposita la versión preprint del artículoCeramic matrix composites (CMC) of 8 mol.% yttria-stabilized zirconia (8YSZ) mixed with natural fiber nano cellulose (0.75, 1, 2 wt%) were prepared by spark plasma sintering (SPS). Nanocellulose markedly improved the densification of the 8YSZ ceramic matrix and induced significant grain size refinement. It was demonstrated that in situ graphitization of nanocellulose during the SPS processing resulted in 6 nm thin turbostratic graphite layers homogeneously covering the 8YSZ ceramic grains. The dielectric properties were analyzed by electrical impedance spectroscopy suggesting a low percolation threshold near or below asymptotic to 1.6 vol% graphite, above which mixed ionic-electronic conduction dominates. The CMCs are stable under reducing conditions (5%H-2/Ar atmosphere) at least until 800 ? with a high conductivity of sigma(dc) = 0.17 S center dot cm(-1) even at 900 ? (8YSZ-2%CNF). These features make the 8YSZ-nanocellulose CMCs promising candidates for application in medium-to high temperature electrochemical devices.engAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/journal articlehttps://doi.org/10.1016/j.jeurceramsoc.2022.04.041open access538.9YSZNanocelluloseCeramic matrix compositeGraphitizationSinteringConductivityFísica del estado sólido2211 Física del Estado Sólido