Results 101 to 110 of about 169 (135)

Cooling rate effects in ZnO varistors

Journal of Materials Science: Materials in Electronics, 1992
Cooling rate effects on ZnO-Bi2O3 varistors are presented. In particular, the oxygen vacancies (V o + ) concentration was determined by electron paramagnetic resonance (EPR) spectroscopy and related to the conductivity. It was found that a higher cooling rate provokes an increase of the V
M. S. Castro, L. Perissinotti, C. M. Aldao   +2 more
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Pulse response characteristics of ZnO varistors

Journal of Applied Physics, 1990
A study is reported of the influences of temperature, circuit resistance, and pulse repetition rate on the ZnO varistor inductive pulse response that is disclosed by voltage overshoot and current undershoot. Exponential time constants are fitted to the voltage overshoot and the current undershoot obtained by using high- and low-impedance pulse supplies,
F. A. Modine, R. B. Wheeler
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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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Photoluminescence study of ZnO varistor stability

Journal of Electronic Materials, 1995
Photoluminescence (PL) measurements were carried out on commercial ZnO varistor samples that were electrically stressed and/or annealed at different temperatures. Changes in the intensity of green and yellow luminescence centers were studied as a function of annealing treatment.
M. S. Ramanachalam, A. Rohatgi, W. B. Carter, J. P. Schaffer, T. K. Gupta   +4 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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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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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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Heat Conductivity in ZnO Varistor Ceramics

physica status solidi (a), 1982
W. Brückner, S. Lehmann, G. Pompe
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Evolution of Physical Models for ZnO-Varistors

1985
The highly nonlinear conduction mechanism in ZnO based ceramics has attracted growing interest during the past decade. With increasing experimental experience model approaches have drifted from mechanisms related to massive non-zinc oxide intergranular layers like space charge limited current or Nordheim-Fowler tunneling to grain boundary effects where
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