Effect of Er2O3 Content on Nonlinear Properties and Impulse Clamping Characteristics of Pr/Co/Cr/Al Co-doped Zinc Oxide Ceramics

다국어 초록 (Multilingual Abstract)

The microstructure, nonlinear properties, and impulse clamping characteristics of Pr/Co/Cr/Al co-doped zinc oxide ceramicswere investigated with various contents of Er2O3. Increasing Er2O3 content increased the density of the sintered pellets from 5.69to 5.83 g/cm3, and decreased the average grain size from 10.6 to 6.5 μm. With increased Er2O3 content, the breakdown fieldincreased from 2318 to 4205 V/cm, and the nonlinear coefficient increased from 19.4 to 40.2. The clamp characteristics wereimproved with the increase of the content of Er2O3. The varistors doped with 2.0 mol% exhibited the best clamp characteristics,in which the clamp voltage ratio was 1.40-1.73 at 1-50 A in an impulse current.

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