Eur. Phys. J. AP
Volume 11, Number 3, September 2000
|Page(s)||155 - 158|
|Published online||15 September 2000|
Improved varistor nonlinearity via sintering and acceptor impurity doping
Physics Department of Shandong University, Jinan Shandong 250100, P.R. China
2 The Thunder Defense Center of Shandong, Jinan Shandong 250100, P.R. China
Corresponding author: firstname.lastname@example.org
Revised: 19 April 2000
Accepted: 9 May 2000
Published online: 15 September 2000
A new varistor system of SnO2-Bi2O3-Nb2O5 was reported in this paper. The electrical field-current density characteristics of this system were investigated by doping different amounts of Bi2O3 and sintering the samples at various temperatures. It is found that adding 0.75 mol% Bi2O3 to Nb-doped SnO2 ceramic resulted in maximum nonlinear coefficient and breakdown voltage with α = 14 and E0.5 = 19 525 V/cm. To improve the density as well as the nonlinearity of this system, different amounts of Co2O3 were added. The optimal conditions for the best nonlinearity were 1300 °C with 0.03 mol% Co2O3 addition. Deviation from this doping content, toward either higher or lower Co2O3 content, causes the deterioration of I−V characteristics. It can be concluded that the incorporation of cobalt oxides into SnO2-based varistors improves the nonlinearity in the low and intermediate current density regions because of the increased barrier height . The experimental results were explained with the defect barrier model for SnO2-based varistors.
PACS: 72.20.Ht – High-field and nonlinear effects / 72.80.Jc – Other crystalline inorganic semiconductors
© EDP Sciences, 2000
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.