Electrical Switching in Glass-Ceramic Structures Based on Vanadium Dioxide

Abstract

The changes in electric current during the switching of vanadium dioxide-based glass-ceramic samples from the off-state to the on-state and vice versa were studied in this paper. The delay in the transition from the off-state to the on-state when a switching voltage U0 is applied to the glass-ceramic sample is related to the time tdon required to heat it to the metal-semiconductor phase transition temperature in VO2. The delay time tdon decreases with increasing U0. It was found that the delay of the reverse transition from on-state to off-state is controlled by the current cord within which the VO2 crystallites of the glass-ceramics are in the metal phase. The delay time t doff of this transition determines the time during which the current cord exists in the VO2 glass-ceramic sample after the voltage U0 is switched off. The value of tdoff increases as U0 increases.