Preparation and properties of TiO2 varistors
- 15 March 1982
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 40 (6), 536-537
- https://doi.org/10.1063/1.93134
Abstract
TiO2 varistors with low resistivity were developed to operate at low voltages and have a reasonably high nonlinearity index. The varistor properties of TiO2 ceramics are due to two different groups of dopants. Pentavalent cation dopants are used to decrease the TiO2 lattice resistivity to ≃10–100 Ω cm at 25°C. Divalent cation dopants with large ionic radii are introduced to the grain boundary region by segregation process during cooling to provide a localized transport barrier. Thus, the conductive grain lattice and the resistive grain boundaries result in a low voltage varistor.This publication has 1 reference indexed in Scilit:
- The dc voltage dependence of semiconductor grain-boundary resistanceJournal of Applied Physics, 1979