Results 201 to 210 of about 10,701 (258)
Some of the next articles are maybe not open access.
Journal of Physics: Condensed Matter, 1993
Among the mechanisms suggested to account for degradation of varistor materials, ion migration has strong support. Mobile, positively charged ions in the depletion layer would be the key element in degradation. In this context, the authors discuss the consequences of an electrical stressing on the current-temperature characteristic of a comment ...
M S Castro, M A Benavente, C M Aldao
openaire +1 more source
Among the mechanisms suggested to account for degradation of varistor materials, ion migration has strong support. Mobile, positively charged ions in the depletion layer would be the key element in degradation. In this context, the authors discuss the consequences of an electrical stressing on the current-temperature characteristic of a comment ...
M S Castro, M A Benavente, C M Aldao
openaire +1 more source
Investigation of dielectric relaxation and degradation behavior of two-step sintered ZnO varistors
Ceramics International, 2019In this study, ZnO varistors using sub-micron varistor powders by two-step sintering were fabricated in contrast to conventional sintering. The microstructures, electrical properties, and the degradation behavior under a severe dc electric field and a ...
Zhiyao Fu +4 more
semanticscholar +1 more source
IEEE International Conference on High Voltage Engineering and Application, 2020
The low-frequency response of metal-oxide varistors, commonly used in telecommunication systems and networks, is investigated. The voltage-current characteristic and capacitance of varistors are obtained experimentally.
E. Staikos, T. Tsovilis
semanticscholar +1 more source
The low-frequency response of metal-oxide varistors, commonly used in telecommunication systems and networks, is investigated. The voltage-current characteristic and capacitance of varistors are obtained experimentally.
E. Staikos, T. Tsovilis
semanticscholar +1 more source
MRS Proceedings, 1981
The theory of ZnO varistors has evolved along with the increasingly detailed experimental description [1-2]. The extreme nonlinearity in the currentvoltage curves naturally led the early investigators to suggest the well-known nonlinear mechanisms, such as space-charge limited currents or electron tunneling. Later experiments made these first proposals
openaire +1 more source
The theory of ZnO varistors has evolved along with the increasingly detailed experimental description [1-2]. The extreme nonlinearity in the currentvoltage curves naturally led the early investigators to suggest the well-known nonlinear mechanisms, such as space-charge limited currents or electron tunneling. Later experiments made these first proposals
openaire +1 more source
Polarization currents in varistors
Journal of Applied Physics, 1990The time, voltage, and temperature dependencies of transient polarization currents are reported for two types of varistors (i.e., ZnO and a SiC composite). The current transients exhibit a power-law time response to a step change in voltage (i.e., I≊I0/tm, where m is slightly less than unity) that persists over a time scale exceeding 10−8–104 s.
F. A. Modine +4 more
openaire +1 more source
Breakdown phenomenon of ZnO varistors caused by non-uniform distribution of internal pores
, 2019Here, we analyzed the internal structure of ZnO varistors with X-ray micro-CT technology and showed that the porosity and pore volume at the radial edge is considerably higher than at other regions.
Pengfei Meng +7 more
semanticscholar +1 more source
Time Dependence of Degradation in ZnO Varistors
physica status solidi (a), 1982Starting from the results of a previous paper on the functional relationship of the degradation of ZnO-varistors and the influence factors (especially U, I,T) an equation system is derived to describe the time-dependence of the degradation. The solutions including the contribution of degradation-, recovery- and increasing effects of currents and ...
W. Brückner +2 more
openaire +1 more source
Effect of Pr6O11 doping on the microstructure and electrical properties of ZnO varistors
, 2019ZnO-Pr6O11 based varistors have anticipated application prospect in electrical system, but the study of the detailed microstructure is still poor. In this paper, the effect of Pr6O11 doping on the microstructure (such as element distributions and grain ...
Wenbin Cao +7 more
semanticscholar +1 more source
Grain growth kinetics and electrical properties of CuO doped SnO2-based varistors
Journal of Alloys and Compounds, 2019Up to now, attempts for developing coarse-grained SnO2-based varistors which exhibit high nonlinearity property at lower voltage have become a challenge without any prominent result because of its unknown grain growth mechanism. In this study, the effect
Pezhman Mahmoudi +2 more
semanticscholar +1 more source
IEEE Electrical Insulation Magazine, 1989
An overview is given of zinc oxide varistors, which are made of semiconducting ceramics with highly nonohmic current-voltage characteristics, which originate at the grain boundaries. These varistors are widely utilized to protect electric power lines and electronic components against dangerous voltage surges.
openaire +1 more source
An overview is given of zinc oxide varistors, which are made of semiconducting ceramics with highly nonohmic current-voltage characteristics, which originate at the grain boundaries. These varistors are widely utilized to protect electric power lines and electronic components against dangerous voltage surges.
openaire +1 more source