Abstract
The role of NiO addition on sintering and electrical conductivity of 8YSZ was systematically studied in this work. Nickel carbonate was added to commercial 8YSZ to give 0.5, 1 and 5 mol% Ni. Sintering of powder compacts was carried out at several dwell temperatures and soaking times. Relative sintered density of Ni-doped pellets reached high values for short soaking times. For longer soaking times the densification of 8YSZ is higher than that of specimens containing the additive. Cubic NiO is the secondary phase formed when the additive exceeds the solubility limit, as determined by Raman spectroscopy. The grain conductivity does not change with additive up to 1 mol% independent on the soaking time. The grain boundary conductivity varies slightly in doped pellets and is lower in NiO-free samples.
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