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

Investigation of the Structural, Optical and Electrical Properties of Zinc Oxide Co-Doped with Fluorine and Cobalt

2021 ◽  
Vol 406 ◽  
pp. 285-291
Author(s):  
Abdallah Diha ◽  
Lahcene Fellah ◽  
Said Benramache ◽  
Okba Belahssen
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Electrical Properties ◽  
Spray Pyrolysis Technique ◽  
Visible Region ◽  
High Spin State ◽  
Secondary Phase ◽  
Optical And Electrical Properties ◽  
Absorption Bands ◽  
Co Doped

Zinc oxide codoped with Fluorine and Cobalt thin films (FCZO) were successfully synthesized on heated glass substrate at 380 °C by spray pyrolysis technique. The influence of doping and codoping on the structural, optical and electrical properties were investigated. X-ray diffraction results showed that the undoped and FCZO films exhibit the hexagonal wurtzite crystal structure with a preferential orientation along [0 0 2] direction. No secondary phase is observed in FCZO films. The optical transmittance of Co doped ZnO thin films reduces up to 80 % as compared to undoped ZnO thin film in the visible region. We have observed three absorption bands at 568, 608 and 659 nm which can be attributed to the d-d transitions of tetrahedrally coordinated Co2+ ion in the high spin state. The band gap was found to be increasing in the range of 3.26-3.39 eV with Co doping whereas it decreases for higher doping of Co concentration.

Chemical preparation and properties of high-field zinc oxide varistors

1986 ◽  
Vol 1 (1) ◽  
pp. 90-99 ◽  
Author(s):  
R. G. Dosch ◽  
B. A. Tuttle ◽  
R. A. Brooks
Keyword(s):  
Zinc Oxide ◽  
Electric Fields ◽  
High Field ◽  
Sintering Temperature ◽  
Chemical Preparation ◽  
Preparation Methods ◽  
Current Densities ◽  
Zno Varistors ◽  
Precursor Powders ◽  
Zinc Oxide Varistors

Chemical preparation methods were developed for high-field ZnO varistors which used precipitation techniques to prepare precursor powders. Varistors were made by sintering uniaxially pressed pellets in the range of 675°–740 °C in air. Properties of these varistors included electric fields (E) in the 10–100 kV/cm range at current densities (J) of 5 A/cm2, nonlinearity coefficients (α) greater than 30 for 2.5≤J≤5.O A/cm2, and densities in the range of 65%-99% of theoretical depending both on sintering temperature and composition.

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