TY - JOUR
T1 - Effect of ZnBi2O4 and Bi2O3 addition on the densification, microstructure, and varistor properties of ZnO varistors
AU - Hsiang, Hsing I.
AU - Chen, Chih Cheng
AU - Kao, Chia Chin
N1 - Funding Information:
The research is partially supported by the fund of Ministry of Science and Technology Taiwan (MOST 110-2622-8-006 -017 -SB ).
Publisher Copyright:
© 2022 Elsevier Ltd and Techna Group S.r.l.
PY - 2022
Y1 - 2022
N2 - In this study, 1 wt% Bi2O3 (1B), 1 wt% ZnBi2O4 (1BZ), and a composite (a mixture of 1 wt% Bi2O3 and various amounts (1-4 wt%) of ZnBi2O4 ,1B1BZ-1B4BZ) were added to ZnO varistors to investigate the effects of additives on the densification, microstructure, and varistor performance. The results showed that the addition of ZnBi2O4 can lower the densification temperature to about 850oC. When the additive was changed from 1 wt% Bi2O3 to 1 wt% ZnBi2O4, the α value increased from 42 to 54, the breakdown voltage increased from 775 V/mm to 1011 V/mm, and the leakage current decreased to 0.11 μA. Additions of ZnBi2O4 and transition metal cations as donor dopants for the ZnO varistors promote oxygen chemisorption at grain boundaries, resulting in greater α value and lower leakage currents. This suggests the addition of ZnBi2O4 can effectively promote densification and improve the varistor properties of ZnO varistors.
AB - In this study, 1 wt% Bi2O3 (1B), 1 wt% ZnBi2O4 (1BZ), and a composite (a mixture of 1 wt% Bi2O3 and various amounts (1-4 wt%) of ZnBi2O4 ,1B1BZ-1B4BZ) were added to ZnO varistors to investigate the effects of additives on the densification, microstructure, and varistor performance. The results showed that the addition of ZnBi2O4 can lower the densification temperature to about 850oC. When the additive was changed from 1 wt% Bi2O3 to 1 wt% ZnBi2O4, the α value increased from 42 to 54, the breakdown voltage increased from 775 V/mm to 1011 V/mm, and the leakage current decreased to 0.11 μA. Additions of ZnBi2O4 and transition metal cations as donor dopants for the ZnO varistors promote oxygen chemisorption at grain boundaries, resulting in greater α value and lower leakage currents. This suggests the addition of ZnBi2O4 can effectively promote densification and improve the varistor properties of ZnO varistors.
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U2 - 10.1016/j.ceramint.2022.09.192
DO - 10.1016/j.ceramint.2022.09.192
M3 - Article
AN - SCOPUS:85139313168
JO - Ceramics International
JF - Ceramics International
SN - 0272-8842
ER -