Abstract
A ZnO-Bi/sub 2/O/sub 3/ two-layer composite formed by RF sputtering was studied as a model of a single grain boundary in a ceramic ZnO varistor to clarify the mechanism of degradation and highly nonlinear conduction. The voltage-current characteristics, capacitance-voltage characteristics, and thermally stimulated currents (TSC) were measured. The breakdown voltage of the specimens can be controlled by changing the thickness of the Bi/sub 2/O/sub 3/ layer. TSC curves for the reverse-bias poling voltage flowed in the direction of depolarization at temperatures below 120 degrees C but in the direction of polarization above 120 degrees C. It is concluded that the mechanism of nonlinear conduction for the composite is related to the accumulation of trapped electrons in the Bi/sub 2/O/sub 3/ layer and negative charges at the ZnO-Bi/sub 2/O/sub 3/ interface. >
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
