Authors: ChoonWoo Nahm
Publish Date: 2006/09/27
Volume: 41, Issue: 20, Pages: 6822-6829
Abstract
The electrical properties and DC accelerated aging characteristics of ZnO–Pr6O11based varistors were investigated with various Dy2O3 contents and sintering times It was found that the Dy2O3 content and sintering time significantly affected electrical properties and their stability The nonlinear exponent with increasing Dy2O3 content varied with ∨shaped reaching maximum of 586 at 10 mol Dy2O3 for varistors sintered for 1 h and with ∧shaped reaching maximum of 463 at 05 mol Dy2O3 for 2 h The leakage current was in the range of 01–11 μA for varistors sintered for 1 h and 03–24 μA for 2 h The increase of sintering time led to lowering of nonlinearity The varistors with 05 mol Dy2O3 sintered for 2 h exhibited the good stability under DC stress of 095 V 1 mA/150 °C/24 h
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