Results 171 to 180 of about 4,266 (203)
Some of the next articles are maybe not open access.
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
[1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials, 2002
The frequency characteristics of the capacity and the dissipation factor of a ceramic ring varistor have been measured in the range from 10 kHz to 1 MHz. From the measurements, the equivalent circuit was determined, considering the internal structure of the ceramic ring varistor.
M. Suzuki +3 more
openaire +1 more source
The frequency characteristics of the capacity and the dissipation factor of a ceramic ring varistor have been measured in the range from 10 kHz to 1 MHz. From the measurements, the equivalent circuit was determined, considering the internal structure of the ceramic ring varistor.
M. Suzuki +3 more
openaire +1 more source
Impulse current withstanding capability of ZnO varistors with influence of varistor size
IEEJ Transactions on Electrical and Electronic Engineering, 2019Through injecting 8/20 and 30/60 μs impulse currents to five kinds of ZnO varistors, the influence of the varistor size on the single impulse current withstanding capability of a ZnO varistor is investigated in this article. A comprehensive damage criterion of a varistor consisting of three aspects, namely, mechanical failure by visual inspection ...
Jianguo Wang +5 more
openaire +1 more source
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
Thermal breakdown in ZnO-varistor ceramics
Physica Status Solidi (a), 1980Thermal breakdowns representing an essential mechanism for the lifetime limitation of ZnO-varistor ceramics are characterized with respect to the parameters of the breakdown point (especially breakdown temperature Tb) (for 21 °C as ambient temperature: Tb = 174 °C).
W. Brückner, W . Moldenhauer, D. Hinz
openaire +1 more source
New low-voltage varistor composites
Journal of Materials Science, 1996New varistor-type polymer composites for low-voltage application have been developed. The filler is made of commercially available doped ZnO-varistor powder. The polycrystalline filler particles act as varistors due to their typical grain-boundary structure.
J. Glatz-Reichenbach +4 more
openaire +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
ZnO Varistors for Transient Protection
IEEE Transactions on Parts, Hybrids, and Packaging, 1977ZnO varistors are novel ceramic semiconductor devices used for protection of electronic equipment against transient overvoltages due to switching surges or lightning. This article describes the microstructure, circuit behavior, and operation of ZnO varistors.
L. Levinson, H. Philipp
openaire +1 more source
ChemInform Abstract: Varistor Ceramics
ChemInform, 1999AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
openaire +1 more source
Varistors based on polycrystalline ZnO:Cu
Applied Physics Letters, 1989Sintered, polycrystalline ZnO ceramics with copper as the only additive exhibit highly nonlinear current-voltage characteristics. Increasing nonlinearity index (α=4–45) with Cu concentration of 0.01–1 mol % is also variable with respect to ceramic processing methods.
Kutty, TRN, Raghu, N
openaire +1 more source