Abstract
BaZr0·7Ce0·2Y0·1O3-δ(BZCY72) proton-conducting ceramics were prepared by Spark Plasma Sintering. The effect of the sintering temperature (1150–1650°C) on the microstructural, crystallographic, and electrochemical properties of BZCY72 as well as long-term stability was investigated. From X-ray diffraction, rhombohedral BZCY72 was observed at all sintering temperatures. Specimen with the highest relative densities of around 99.5% were obtained at 1450°C, also exhibiting high stability in ambient laboratory air over a period of six months. Total conductivities of 1.01 · 10−3S cm−1were obtained at 600°C in moist 5%H2/Ar. With increasing temperature the samples were denser, exhibited larger crystallite and grain sizes and consequently higher GB conductivities. A small increase in bulk conductivity was discussed in terms of decrease of degree of octahedra tilting and increase of B–O bond lengths.
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