scholarly journals Effect of Cobalt Oxide Addition on Electrical Properties of Praseodymium-based Zinc Oxide Varistors

2005 ◽  
Vol 18 (10) ◽  
pp. 896-901
Author(s):  
Choon-Woo Nahm ◽  
Jong-Ah Park ◽  
Dae-Hoon Yoo ◽  
Hyoung-Kwon Suh
Keyword(s):  
Zinc Oxide ◽  
Electrical Properties ◽  
Cobalt Oxide ◽  
Oxide Addition ◽  
Zinc Oxide Varistors

Cobalt oxide addition effects on the microstructure and electronic properties of CuZn ferrites

2015 ◽  
Vol 2015 (CICMT) ◽  
pp. 000131-000138
Author(s):  
Hsing-I Hsiang ◽  
Jui-Huan Tu ◽  
Wen-Chin Kuo ◽  
Chi-Yao Tsai ◽  
Li-Then Mei
Keyword(s):  
Dielectric Properties ◽  
Solid State ◽  
Electrical Properties ◽  
Grain Boundary ◽  
Cobalt Oxide ◽  
Solid State Reaction ◽  
Copper Ions ◽  
Oxide Addition ◽  
Second Phases ◽  
Space Polarization

The effects of cobalt oxide addition on the microstructure and electrical properties of CuZn ferrites were investigated. CuZn ferrites with compositions of (CuO)0.2(ZnO)0.8(Co3O4)x/3 (Fe2O3) 0.986-2x; x = 0 , 0.02, 0.04, 0.08, 0.1 were synthesized using a solid state reaction. It was observed that the addition of cobalt will change the amounts and distribution of Cu2+, Cu+, Fe2+, and Fe3+ in the grain and grain boundary. The segregation of copper ions at the grain boundary was observed as the substitution of cobalt was increased. Moreover, as the x value was increased above 0.04, second phases of CuO and ZnO were found. The different amounts and distribution of Cu2+, Cu+, Fe2+, and Fe3+ in the bulk and grain boundary for samples added with different amounts of cobalt changed the conductivity activation energies of the bulk and grain boundary, and hence affected the space polarization and dielectric properties.

Influence of the preparation process on the electrical properties of high-field co-doped zinc oxide varistors

2013 ◽  
Vol 39 (8) ◽  
pp. 8869-8875 ◽  
Author(s):  
Geoffroy Gadacz ◽  
Sophie Beaudet-Savignat ◽  
Laurence Longuet ◽  
Jean-Louis Longuet
Keyword(s):  
Zinc Oxide ◽  
Electrical Properties ◽  
High Field ◽  
Preparation Process ◽  
Zinc Oxide Varistors ◽  
Co Doped
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