Effect of Annealing on Electrical Degradation Characteristics of ZnO Varistors

Masayuki Takada; Shinzo Yoshikado

doi:10.4028/www.scientific.net/KEM.388.7

Paper Titles

Preface

(Mg,Zn)O/ZnO Heterostructures Prepared by Pulsed Laser Deposition
p.3

Effect of Annealing on Electrical Degradation Characteristics of ZnO Varistors
p.7

Study on Recovery of Electrical Degradation of ZnO Varistors
p.11

Electrical Degradation Caused by Electro-Static Discharge Pulse in ZnO-Based Multilayer Varistor
p.15

Photoluminescence from ZnO Thin Film Deposited on R-Plane Sapphire Substrate by RF Magnetron Sputtering
p.19

Impurity Contamination and Diffusion during Annealing in Implanted ZnO
p.23

Synthesis of Well-Aligned ZnO Nanowhisker Films Using Aqueous Solution for Use in Dye-Sensitized Sensor
p.27

High-Rate Charge-Discharge Performance of Composite Electrodes of FeOOH-Based Amorphous Particles and Carbon Powder
p.33

HomeKey Engineering MaterialsKey Engineering Materials Vol. 388Effect of Annealing on Electrical Degradation...

Effect of Annealing on Electrical Degradation Characteristics of ZnO Varistors

Abstract:

The effects of the thermally annealing of Bi-Mn-Co-Sb2O3-added ZnO varistors on their electrical degradation were investigated. For the samples with 0.01mol% Sb2O3added and without Sb2O3, no marked difference in the non linearity index of the voltage-current (V-I) characteristics was observed upon electrical degradation for the annealed and nonannealed samples. Upon increasing the amount of Sb2O3 added, the values of  increased after electrical degradation for the annealed samples. Moreover, the value of  after electrical degradation was proportional to the full width at half maximum (FWHM) of the X-ray diffraction peak for Zn2.33Sb0.67O4-type spinel particles under various annealing conditions. The added Sb2O3 did not dissolve in the ZnO grains but became segregated at grain boundaries. Therefore, it is speculated that the increase in the FWHM for the spinel particles is due to the increase in the numbers of fine spinel particles at grain boundaries and triple points.

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Periodical:

Key Engineering Materials (Volume 388)

Pages:

7-10

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.388.7

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Online since:

September 2008

Authors:

Masayuki Takada, Shinzo Yoshikado

Keywords:

Electrical Degradation, Ion Migration, Oxygen Ions, Spinel Particle, ZnO Varistor

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