Abstract: (6465 Views)
In the present work, the addition of CuO to the (Co, Cr, Nb)-doped SnO2 varistor systems for low voltage applications has been studied and compared with a typical ZnO-based formulation. The SEM micrographs exhibit a single phase microstructure having an average grain size of 10μm for SnO2- based varistors whereas the ZnO-based varistors show a multiphase structure with larger grains. The breakdown voltage, nonlinear coefficient, and leakage current are 0.9kV/cm, 35, 7µA, respectively for the SnO2 based varistors which compare favorably with those of the low voltage ZnO-based varistors. A comparative study of the degradation phenomenon in the two systems indicates a superior behavior for the SnO2-based varistors.
Type of Study:
Research |
Subject:
Bioceramics Received: 2014/08/26 | Accepted: 2014/08/26