Switching and oscillation phenomena in SnO2-VOx-PdO ceramics

Abstract

Switching and oscillation were found in SnO2-VOx-PdO ceramics. This switching does not appear above 60°C. However, under 40°C, it comprises two switching actions and depends upon the ambient temperature. The oscillation is irregular and the amplitude is as great as 30−40 V at room temperature.

Current-induced electrical self-oscillations across out-of-plane threshold switches based on VO2 layers integrated in crossbars geometry

“…24 First observations of threshold switching in VO 2 bulk materials show that the E-MIT is described by an S-shaped current-voltage characteristic of the devices, characterized by a current controlled negative differential resistance (CC-NDR). [25][26][27][28] Under a specific electrical excitation, this CC-NDR effect underlies the onset of spontaneous electrical oscillations across two-terminal devices integrating bulk VO 2 , 26-28 with oscillation frequencies in the kHz range. Reported frequencies of 1 MHz in VO 2 thin films integrated in planar two-terminal devices [16][17][18][19][20] and even 5 MHz in W x V 1Àx O 2 nanobeams 29 make such devices attractive as voltage or current-controlled oscillators, frequency modulators, or inverters in electronic circuits.…”

Nonlinear Phenomena and Deterministic Chaos in Systems With Vanadium Dioxide

“…Chaotic oscillations have been obviously first observed in [7]. The experimental works have been carried out on single crystals [5,8], thin films [6], [9], [10] and ceramics [7]. Chaotic dynamics and noise effects in vanadium dioxide are of considerable interest because of potential technical applications of the material.…”

“…For example, low-frequency noise at the thermally induced MIT has been studied in [4]- [6], and the noise effects at electrical switching in VO2-based structuresin [7], [8]. Chaotic oscillations have been obviously first observed in [7]. The experimental works have been carried out on single crystals [5,8], thin films [6], [9], [10] and ceramics [7].…”

“…Therefore, the VO2 based switching devices are expected to demonstrate complex behaviors, from ordinary noise to deterministic chaos. For example, low-frequency noise at the thermally induced MIT has been studied in [4]- [6], and the noise effects at electrical switching in VO2-based structuresin [7], [8]. Chaotic oscillations have been obviously first observed in [7].…”

Electron beam modification of vanadium dioxide oscillators

“…Electrical oscillations in VO 2 ‐based systems have been widely recognized since 2008 and even some time earlier ; recent research on such systems application in oscillatory neural networks (ONN) and band generators have resurrected scientists’ interest in this area.…”