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A Novel Test Method for Ultrafast Pulse Response Characteristics of ZnO Varistor Ceramics
Author(s) -
Shi Wei,
Xie Guangyong
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12293
Subject(s) - varistor , materials science , nanosecond , optoelectronics , ceramic , ultrashort pulse , capacitance , capacitor , impulse (physics) , rise time , voltage , laser , optics , electrical engineering , composite material , electrode , chemistry , physics , quantum mechanics , engineering
A ZnO varistors in series connected with a semi‐insulating GaA s photoconductive switches ( SI ‐ GaA s PCSS 's), a test method for ultrafast pulse response characteristics of ZnO varistor ceramics with DC bias was presented for the first time. The DC voltage distribution of the PCSS 's and the varistors was measured in a dark state and the pulse response characteristics of the ZnO varistor ceramics was examined by a nanosecond laser pulse illuminating the PCSS 's. The results indicate that the electric pulse output from the varistors includes capacitive current and conduction current and there is a time delay between their peaks. It is revealed that ZnO varistors has a nonlinear conductivity for the nanosecond electric impulse excitation and the barrier capacitance decay constant of the ceramics sample is 105 ns, which is explained through the analysis of examining the material structure and the conductive mechanisms.