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Compositional Analysis and High Resolution Imaging of Grain Boundaries in Pr-DOPED ZnO Ceramics

An electron microscopy investigation has been conducted in ZnO:Pr:Co varistor structures prepared by a new in-diffusion method. It has been shown that some boundaries host intergranular precipitates of a Pr x O y -based phase. All observations lead to the conclusion that grain boundaries exhibit Pr segregation, while Co is homogeneously distributed in the ZnO matrix. No continuous intermediate layer is present at the ZnO/ZnO boundary nor at the Pr 2 O 3 /ZnO interfaces. This is consistent with a barrier model based solely on a space charge depletion region(s).