Non-linear 𝐼â€�?�ð�?��?? characteristics of doped Sn1â€�?�ð�?�¥Ti𝑥O2 (0.0 < ð‘�? < 0.25) system

[摘要] The solid solutions of Sn_{1â€�?�ð�?��?}Ti_ð‘�?O₂ (0.0 < ð‘�? < 0.25) were prepared by the usual high temperature ceramic processing techniques with small amounts of dopants such as Nb, Co, Al. The electrical measurements (log 𝐼â€�?�log ð‘�??) on the ohmically metal electroded sintered pellets showed the non-linear behaviour. The nonlinear coefficient was found to decrease from 12 to 3 with increase in ð‘�?. On the other hand, the breakdown voltage (𝐸_b) showed the increase with the increase in ð‘�?. This complex electrical behaviour is explained on the effects of the three dopants (as varistor former, performance enhancer and highlighter) on the microstructural features of the dense pellet.

[学科分类] 材料工程

[关键词] Varistors;SnO2;TiO2;nonlinear coefficient;breakdown voltage.