High nonlinearity and low leakage current SnO2 varistor ceramics by co-doping with yttrium and tantalum

We report on co-doping of tantalum and yttrium into SnO2 varistors. The electrical parameters of the pre pared devices show that a moderate tantalum doping level reduces the leakage current while maintaining a high voltage gradient and excellent nonlinearity. Yttrium and tantalum doping levels of 0.05 mol% and 0.003 mol%, respectively, gave the best electrical performance, including a nonlinear coefficient of 54, leakage current of 3.2 mu A/cm(2) and voltage gradient of 485 V/mm. (c) 2020 Published by Elsevier B.V.

Automated summary

The study focused on co-doping of tantalum and yttrium into SnO2 varistors, showing that moderate tantalum doping can reduce leakage current while maintaining high voltage gradient and excellent nonlinearity. The best electrical performance was achieved with yttrium and tantalum doping levels of 0.05 mol% and 0.003 mol%, respectively.