On the basis of experiments, the ZrO2 grain boundaries are classified into three types: the ''clean'' grain boundaries, the grain boundaries with amorphous phases and the grain boundaries with crystal ...
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On the basis of experiments, the ZrO2 grain boundaries are classified into three types: the ''clean'' grain boundaries, the grain boundaries with amorphous phases and the grain boundaries with crystal phases. The structure and property of the three types of grain boundaries were analyzed from the aspects of microstructure and lattice defects, and the conductivity of the crystal grain boundary phases was calculated with the effective-medium theory to be as three times higher as that of the matrix, an idea of further enhancing the ionic conduction of ZrO2 by modifying grain boundaries was thus proposed. The effect of the ZrO2 grain boundaries on the EMF of the oxygen sensor was discussed with simplified models.
A feasible way to further enhance the ionic conduction of ZrO2 is to decrease the grain boundary resistivity by adding new ingredients. Thus, the effect of the addition of Al2O3, the only oxide that has been found to ...
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A feasible way to further enhance the ionic conduction of ZrO2 is to decrease the grain boundary resistivity by adding new ingredients. Thus, the effect of the addition of Al2O3, the only oxide that has been found to reduce ZrO2 resistivity, on the ionic conductivity of ZrO2 was investigated, and the results are reported in this paper.
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