Abstract
When tin oxide is doped with Sb 2O 3 and CoO, it shows highly nonlinear current ( I)–voltage ( V) characteristics. Addition of CoO leads to creation of oxygen vacancies and helps in sintering of SnO 2. Antimony oxide acts as a donor and increases the conductivity. The results are nearly same when antimony oxide is replaced by tantalum oxide. The grain size of these sintered ceramics varies from 5 to 7 μm and the grain boundary barrier height ( Φ B) is in the range of 0.5 eV. The observed nonlinear coefficient ( α) is 25 and 27 for antimony and tantalum oxide, respectively and the breakdown field is in the range of 1250 V cm −1.
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