کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1648770 | 1007564 | 2010 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Effects of cobalt doping on the electrical characteristics of Al-doped ZnO varistors Effects of cobalt doping on the electrical characteristics of Al-doped ZnO varistors](/preview/png/1648770.png)
The effects of cobalt additive on the electrical characteristics of the Al-doped ZnO varistors are studied in this paper. The current–voltage characteristics of the varistor samples have been investigated in a range from small to large current. With the amount of the doped cobalt increased, the leakage currents of the Al-doped ZnO varistors are inhibited, and their nonlinear coefficients increase remarkably as well. In addition, their breakdown electric fields increase in a small extent and their residual voltage ratios change slightly. Furthermore, the donor densities and the barrier heights of samples decrease with the cobalt content increased. The XRD patterns show that the Bi-rich phase and the willemite phase vary obviously in the varistor samples with various content of cobalt additive.
Journal: Materials Letters - Volume 64, Issue 9, 15 May 2010, Pages 1081–1084