| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1654649 | Materials Letters | 2005 | 4 Pages |
Abstract
The microstructure and electrical properties of the varistors, which are composed of ZnO-Pr6O11-CoO-Cr2O3-La2O3 (ZPCCL)-based ceramics, were investigated with various La2O3 contents. The increase of La2O3 content led to more densified ceramics, whereas the La2O3 more than 1.0 mol% decreased the nonlinear properties. The highest nonlinearity was obtained from 0.5 mol% La2O3, with 81.6 in nonlinear exponent and 0.1 μA in leakage current. As the La2O3 content increased, the donor concentration and density of interface states increased in the range of 0.64×1018–16.89×1018/cm3 and 2.21×1012–5.16×1012/cm2, respectively. However, the barrier height decreased with increasing La2O3 content, reaching a maximum (1.47 eV) in 0.5 mol% La2O3.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Choon-Woo Nahm,