Effect of Y-doping on the phase relation and electrical properties of Fe-doped BaZrO3. Issue 2 (February 2018)

• Record Type: Journal Article
• Authors: Kim, Dongyoung; Lee, Daae; Joo, Jong Hoon
• Is Part Of: Journal of the European Ceramic Society. Volume 38:Issue 2(2018)
• Page Start: 535
• Page End: 542
• Publication Date: 2018-02
• Subjects: Y-doped BaZrO3 -- Phase relation -- Mixed protonic-electronic conductor -- Electrical properties -- Proton conductivity; 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.2017.09.019
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: The effects of the co-doping of Y in Fe-doped BaZrO3 (BaZr0.7- y Fe0.3 Y y O3- δ ) on the phase relation and electrical properties are investigated in this study. While a single phase is formed up to y = 0.1 by the substitution of Y for Zr-sites (phase-1), the amphoteric substitution of Y for both Zr-sites and Ba-site (phase-2) is observed above y = 0.1. Electrical conductivity measurements suggest that p -type conduction prevails under an oxidizing atmosphere. The hole conductivity increases with an increase of Y concentration up to y = 0.1, but a further increase of Y concentration causes a decrease in the conductivity. The maximum conductivities of both bulk and grain boundary are obtained at y = 0.1, and a further increase of Y concentration leads to a decrease of the conductivity due to the possible formation of phase-2 with the partial replacement of Y for Ba-sites ( Y B a ). Partial proton conductivity is also improved by Y-doping up to y = 0.1, but a further doping cannot contribute to an increase in the proton conductivity. The results indicate that the mixed proton and hole conductivity of Fe-doped BaZrO3 can be improved by the co-doping of a rare-earth acceptor (Y 3+ ), but the doping level is limited to y = 0.1 to avoid the formation of phase-2.