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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...
The electrical and dielectric properties of a commercial ZnO-based varistor ceramics were measured in the process of 8/20mus impulse current degradation with a current density of 1725A/cm2. The characteristic of U-I in the pre-breakdown region was mainly investigated. It was found that the varistor voltage U1mA will first increase rapidly with the times of impulse, and then remain stable and finally...
The effect of two Ag electrodes on the electrical properties of SrTiO3 ring varistors were presented in this paper. It was found that one of them results in ohmic contact while the other results in non-ohmic contact between electrode and ceramics. Compared with the results achieved by using of In-Ga alloy paste, non-ohimic contact lead to larger varistor voltage U10mA, larger nonlinear coefficient...
The influence of magnetized water on the electrical properties of ZnO varistor ceramics was investigated by electrical property measurement and frequency spectrum technology. It was found that, compared with results of deionized water, higher varistor voltage E1mA and lower non-linear coefficient alpha can be achieved by using 0.2 T magnetized water, while E1mA and alpha of 0.3T magnetized water are...
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