Results 81 to 90 of about 9,079 (268)
Polarity engineering in polycrystalline ZnO by inversion boundaries [PDF]
, 2014 Two distinctive polarity-engineered microstructures were obtained in polycrystalline ZnO ceramics by inducing two different types of inversion boundaries (IBs) inside individual grains to examine the effect of the different polarities on the varistor ...
Jeon, Sang-Yun +6 more
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High Voltage, Volume 10, Issue 1, Page 78-87, February 2025.Abstract Metal oxide varistors (MOVs) are extensively employed in DC circuit breakers (DCCBs) to suppress overvoltage, dissipate energy and build up voltage after interruption. Despite their widespread use, the performance of MOVs under short‐time, double energy absorption conditions is not well understood, posing a challenge to their application in ...
Chen Long +5 more
wiley +1 more source
Effect of the sintering temperature on the electrical properties of Y–Al‐doped ZnO varistors
International Journal of Ceramic Engineering &Science, Volume 7, Issue 1, January 2025.The effect mechanism of sintering temperature on the electrical properties of Y–Al‐doped ZnO varistors was revealed in this paper. It not only enriches the theoretical basis for the performance regulation of ZnO varistors but also provides a scientific basis for their application under higher requirements.
Lei Wang +7 more
wiley +1 more source
Diffusion of the 65Zn radiotracer in ZnO polycrystalline ceramics
Materials Research, 2003 Zinc self-diffusion coefficients were measured in polycrystalline ZnO of high density (>99% of the theoretical density) and of high purity (> 99.999%).
Maria Auxiliadora das Neves Nogueira +2 more
doaj +1 more source
European Journal of Applied Mathematics, 2016 A three-dimensional model of the varistor device is proposed. The thermal and electric conductivity of the material are taken to depend, in addition to the electric potential, on the temperature. Two theorems of existence and uniqueness of solutions for the boundary-value problem which determine the potential and the temperature inside the device are ...
openaire +1 more source
Tekhnologiya i Konstruirovanie v Elektronnoi Apparature, 2014 Prolonged exposure of zinc oxide varistors to the electrical load leads to current-voltage characteristics (CVC) deformation, which is associated with a change in the height and width of the intergranular barriers, which are the main structural element ...
A. S. Tonkoshkur, A. V. Ivanchenko
doaj +1 more source
Studies of in-service and laboratory failures of metal-oxide distribution surge arresters [PDF]
, 2003 We describe the findings from tests and inspections of arresters withdrawn from service, the results of laboratory studies with multipulse lightning currents and high temporary over-voltages, and comparisons of in-service and laboratory failure modes. We
Darveniza, M., Saha, T. K., Wright, S.
core
Effect of Co3O4 doping and sintering temperature on optical energy band gap properties in Zn-Bi-Ti-O varistor ceramics [PDF]
, 2017 It is necessary to investigate the electronic states of ceramic based ZnO vasristor and effect of doped impurities at different concentration. Band gap (Eg) of the ceramic (99-x) mol% ZnO+0.5 mol% Bi2O3+0.5 mol% TiO2+ xCo3O4 where x = 0, 0.2, 0.4, 0.6 ...
Mohd Ghazali, Mohd Sabri +5 more
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Nonlinear electrical properties of grain boundaries in oxygen ion conductors - Modeling the varistor behavior [PDF]
, 2005 We report on numerical simulations of the grain-boundary varistor behavior recently observed in Y2O3-doped CeO2 of high purity. The aim of this study is to disclose the nature of the nonlinear electrical properties of the grain boundaries in oxygen ion ...
Guo, X., Meyer, R., Waser, R.
core +1 more source
Control of Varistor Voltage by Grain-size Control of Bi-added ZnO Varistors
IOP Conference Series: Materials Science and Engineering, 2011 Relationship between the grain size of ZnO and the amounts of Bi and Sb for Bi-Ba-Sb-Co-Mn-added ZnO was investigated. The amount of Bi at which the grain size of ZnO became the maximum shifted to the notably larger one by adding small amount of Sb such as 0.01 mol%.
Ai Fukumori +3 more
openaire +1 more source