Abstract
Current–voltage characteristics of (wt.%) 45VO2–15VPG–5Cu–35SnO2 ceramics in the on-state were investigated in the electric current interval between 0.3 A and 5 A. Transition from the region with negative differential resistance to the region with positive differential resistance is observed in current–voltage characteristic when electric current increases. The reason of such behaviour is the limitation of lateral expansion for the filament of VO2 metal phase by the sample’s size. The change in the sign of differential resistance occurs, when the cross-section area of the filament reaches the sample’s cross-section area. In this case the phase transition of VO2 into metal state is completed in the whole volume of the sample. Therefore at further increasing of current the current–voltage characteristic has the positive differential resistance.
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