Results 181 to 190 of about 122,447 (215)

Intrinsic defects in ZnO varistors

Journal of Applied Physics, 1983
Theoretical calculations are presented for equilibrium concentrations of zinc and oxygen vacancies in ZnO. Results are presented at the sintering temperature, and also at room temperature. Theoretical calculations of reaction constants show that the intrinsic donor is the oxygen vacancy, rather than the zinc interstitial.
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High-field ZnO-based varistors

Journal of Physics D: Applied Physics, 1995
The role of principal additives is investigated in an attempt to obtain high-threshold-field ZnO-based varistors in the traditional way. In the order of effect level, these are Sb2O3, Co3O4, Cr2O3 and MnO2. In the range of 0.5-5 mol%, the increase of additive content decreases the average ZnO grain size.
A Bui, H T Nguyen, A Loubiere
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Advances in ZnO–Bi2O3 based varistors

Journal of Materials Science: Materials in Electronics, 2015
In this review paper detailed development of the ZnO–Bi2O3 based polycrystalline varistors are presented as the technological importance emerged with the rapid applications of the gapless surge protectors superseding traditional gapped SiC designs. The excellent symmetric nonlinear current–voltage (I–V) characteristic of these varistors results from ...
Jianying Li, Shengtao Li, Pengfei Cheng, Mohammad A. Alim   +3 more
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Spinel Phases in ZnO Varistors

Physica Status Solidi (a), 1980
K.-H. Bäther, D. Hinz, N. Mattern, M. Bitterlich, W. Brückner   +4 more
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Grain junction properties of ZnO varistors

Applications of Surface Science, 1979
Abstract Grain-grain junctions in ZnO varistor ceramics were electrically contacted by conventional photoresist- and contact deposition techniques and investigated in terms of the statistical distribution of the breakdown voltage. Its maximum appears at 3.4 V for constant current of 5 μA.
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ZnO varistors with iron oxide

2020
ZnO VARI STORE WITH IRON OXIDE CAM, Ibrahim Faculty of Engineering Department of Metallurgical Engineering, M. S. Thesis Supervisor: Prof. Dr. Muharrem T1MUCÎN 114 pages, February 1989 ABSTRACT In the present work, addition of Fe2Û3 on the characteristics of ZnO-var istors were studied.
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Influence of partial discharges on ZnO varistors

Proceedings of the 2004 IEEE International Conference on Solid Dielectrics, 2004. ICSD 2004., 2004
The varistors used in HV overvoltage limiters are constantly exposed to operating voltage and environmental hazards and also to transient hazards associated with, among others, overvoltages or pollution. Pollution exposures and the associated partial discharges (PD) are a major problem in the operation of overvoltage limiters.
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Microscopic degradation model for ZnO varistors

Physica Status Solidi (a), 1983
K.-H. Bätheb, W. Brückner, W. Moldenhauer, H.-P. Brückner   +3 more
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Heat Conductivity in ZnO Varistor Ceramics

physica status solidi (a), 1982
W. Brückner, S. Lehmann, G. Pompe
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Observation of an electrical breakdown at ZnO Schottky contacts in varistors

Journal of the European Ceramic Society, 2021
Benjamin Kaufmann
exaly