Low voltage varistor ceramics based on SnO2

S. R. Dhage, V. Ravi, O. B. Yang
2007 Bulletin of Materials Science  
The nonlinear current (I)-voltage (V) characteristics of tin dioxide doped with either Nb 2 O 5 and CoO or Sb 2 O 3 and CoO show promising values of nonlinear coefficient (α) values (~11) with low breakdown voltages (E B , ~40 V mm -1 ). The pentavalent antimony or niobium acts as donor and increases the electronic conductivity. The crucial parameter for obtaining low breakdown voltage is the grain size, which depends upon sintering duration and temperature of these oxide ceramics.
doi:10.1007/s12034-007-0092-8 fatcat:ufhf5gkjhnfefpchuryow72j6y