Results 191 to 200 of about 135,374 (222)

Evaluation of ZnO Varistors by Photoacoustic Spectroscopy

Japanese Journal of Applied Physics, 2001
ZnO varistors degraded under various conditions were evaluated by photoacoustic spectroscopy (PAS). The degradation where the grain boundary is damaged by DC bias stress is more than that by AC bias stress. PAS, however, reveals that the interior of the grains of the sample degraded by AC bias stress is much more damaged than that by the DC bias ...
Yasuhiro Ohbuchi Yasuhiro Ohbuchi, Akitsugu Kimura Akitsugu Kimura, Toshio Kawahara Toshio Kawahara, Jun Morimoto Jun Morimoto, Taro Toyoda Taro Toyoda   +4 more
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Dopant Effects to Pores in ZnO Varistors

2006 IEEE 8th International Conference on Properties and applications of Dielectric Materials, 2006
Pore is an intrinsic property of ZnO varistor. There are two different shapes of pores in ZnO varistor samples, one is sphere shape, and another is irregular polyhedron. Pores are caused by air particles wrapped in initial varistor compact and grains-surrounded spaces during the sintering. By analyzing the pore phenomena in two different systems of ZnO
Youping Tu, Lijian Ding, Jinliang He, Jun Hu, Se-won Han, Han-goo Cho   +5 more
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ZnO varistors for liquid crystal displays

Journal of Applied Physics, 1982
ZnO varistors are excellent materials for multiplexing dichroic liquid crystal displays. We describe here the development of varistor materials tailored for this application. The varistors are large (∼25 cm diameter), uniform, and have relatively low dielectric constant.
Lionel M. Levinson, Donald E. Castleberry, Charles A. Becker   +2 more
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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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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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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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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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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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