ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In this paper, the effect of Cr2O3 addition on the electrical properties and microstructures ofWO3-MnO2 ceramics was studied. The samples were fabricated by the conventional solid phase reactiontechniques. The current-voltage curves and impedance spectra of sintered samples were measured at roomtemperature. The samples without Cr2O3 doping exhibit the max nonlinear coefficient α above 8 in currentregion from 1mA to 10mA and an unstable characteristic of current-voltage curve for repeat measuringcycle, while the samples doped with Cr2O3 display lower nonlinearity with α about 5 and an improvedstability of current-voltage curve at the same conditions. The impedance measurements indicate that theinfluence on electrical properties comes from grain boundary as well as grain. SEM shows the doping ofCr2O3 into WO3-MnO2 ceramics suppresses obviously the growth of WO3, and XRD analysis reveals thecoexistence of WO3 phases with some manganese tungstates and chromium tungstates. The problemsrelated to electrical transporting mechanism were discussed simply
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2334.pdf
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