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ZnO-based varistors have been extensively used for the protection of devices and equipment against voltage surges because of their exceptional nonlinearity in current-voltage characteristics and the ability to absorb large amounts of energy. Since the composition and fabrication process are complicated, impurities are inevitable in the varistors. Sodium impurities are frequently present in the raw...
CaCu3Ti4O12 ceramics were prepared by coprecipitation method. The pH value of reaction solutions plays an important role in the coprecipitation process. First, the pH value of Ti precursor solution must be controlled at around 3, in order to get clear Ti solution. In addition, the pH value of Ca and Cu precursor solution has a great influence on the properties of both precursor and CaCu3Ti4O12 ceramics...
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