Low-temperature sintering and enhanced stability of fluorine-modified BaZr0.8Y0.2O3-δ synthesised by a sol-gel alkoxide route. Issue 1 (January 2023)

• Record Type: Journal Article
• Authors: Triviño-Peláez, Ángel; Mosa, Jadra; Pérez-Coll, Domingo; Aparicio, Mario; Mather, Glenn C.
• Is Part Of: Journal of the European Ceramic Society. Volume 43:Issue 1(2023)
• Page Start: 99
• Page End: 108
• Publication Date: 2023-01
• Subjects: Proton-conducting perovskites -- Barium zirconate -- BZY -- Sol-gel -- Protonic ceramic cells; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2022.09.042
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Sol-gel synthesis using alkoxides is employed to obtain fluorine-modified BaZr0.8 Y0.2 O3-δ nanopowders with Ba excess at 750 °C. Possible effects of F loss at high temperature were limited on densifying at the low temperature of 1200 °C for 4 h on addition of ZnO as sintering agent. The presence of F in sintered samples was confirmed by X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry. XPS and Raman spectroscopy indicated that F doping of BZY inhibits carbonate formation. Conductivity measurements for prolonged periods in wet H2 -containing and CO2 -containing atmospheres at 500 °C also demonstrated chemical stability. The temperature dependence of the electrical conductivity of sintered samples in wet and dry N2 and O2 indicates that the grain-boundary dominates the electrical behaviour to 500 °C, above which the bulk process dominates. Ionic conduction is prevalent at low temperature, with a transition to a mixed ionic-electronic conducting behaviour at 450 °C.