Abstract
The microstructure and electrical properties of ZnOBi2O3–MnO2-based varistor ceramics doped with different Cr2O3 content were investigated. The addition of Cr2O3 caused a transformation of minor secondary phases from Bi7.72Mn0.28O12.14 to Bi2O3 dissolving different amount of Cr. The average grain size of sample with 0.2mol% Cr2O3 increased remarkably from a range of 6.38–6.62μm to 9.79μm, and the barrier voltage decreased to 1.31V. With the increase of Cr2O3, the nonlinear coefficients of sintered samples decreased to 25.0 at 0.2mol%, and then it further increased up to 40.0, a comparable value with the one of the undoped sample, at 0.8mol%. The results showed small amounts of Cr2O3 promote the grain-growth at a relatively low sintering temperature, and thus result in the shift of breakdown voltages to a lower value.
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.
