Kinetics of current in glass-ceramics on the base of vanadium dioxide
Journal of Electroceramics, ISSN: 1573-8663, Vol: 43, Issue: 1-4, Page: 34-40
2019
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Article Description
The kinetics of current at switching of the VO based glass-ceramics samples from a state with high resistance (the off-state) to a state with low resistance (the on-state) and vice versa was studied. The delay of the transition from off-state to on-state, when a switching voltage U is applied to a sample, is related to the time t required to heat a sample to the metal-semiconductor phase transition temperature in VO. The delay time t decreases with the increase of U. It is shown that the calculated dependence of t on the voltage U, obtained with the simplified heat balance equation of a sample and the “critical temperature” model, is in good conformity with the experimental data. It was found that the delay of reverse transition from the on-state to the off-state controls the conductive channel, within which the crystallites of VO are in the metallic phase. The delay time t of this transition determines the time during which, after turning off the voltage U, a conductive channel exists in a sample. The value of t increases with the increase of U. The reason for this behavior is the expansion of conductive channel with the increase of U. As a consequence, takes place the increasing number of VO crystallites in the metallic phase. Therefore, t increases due to an increase in the time required for dissipation of the heat released during the transition of the VO crystallites from the metallic phase to the semiconducting phase.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85074704605&origin=inward; http://dx.doi.org/10.1007/s10832-019-00187-2; http://link.springer.com/10.1007/s10832-019-00187-2; http://link.springer.com/content/pdf/10.1007/s10832-019-00187-2.pdf; http://link.springer.com/article/10.1007/s10832-019-00187-2/fulltext.html; https://dx.doi.org/10.1007/s10832-019-00187-2; https://link.springer.com/article/10.1007/s10832-019-00187-2
Springer Science and Business Media LLC
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