Formation and stabilization mechanism of a nano crystalline phase of Y doped BaZrO3 formed at high temperature

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Y doped BaZrO3 (BZ) is one of the candidate materials for the proton conductive oxide with a superior chemical stability in addition to the highest conductivity. The formation mechanism of the nano crystalline phase of Y doped BaZrO3 phase was investigated for improving the grain boundary property which is the one of the problems to be overcome for application of the material. Because the nano crystalline phase which formed after long time 1600 degree C sintering process would be formed from the liquid chose as target phase, the different cooling period from 1600 to 800 degree C after 10h sintering at 1600 degree C was set for the sample preparation. The effect of the cooling period was shown in the composition change due to the BaO evaporation and dopant concentration in the BaZrO3 phase. The effect of liquid phase from the local inhomogeneous composition was also observed.