Results 31 to 40 of about 290 (180)

The Degradation of Epoxy Resin-Coated ZnO Varistors at Elevated Temperatures and Ambient Humidity Conditions

Active and Passive Electronic Components, 2003
The degradation of the epoxy resin-coated commercial ZnO varistors at elevated temperatures and ambient humid conditions has been investigated experimentally.
Jianying Li, Shengtao Li, M. A. Alim, G. Chen   +3 more
doaj   +1 more source

Influence of Fine Crystal Percentage on the Electrical Properties of ZnO Ceramic-Based Varistors

Crystals, 2020
Herein, the effect of nanocrystal percentage in bulk-ZnO varistors was studied. The structure of ZnO nanocrystals was examined using X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM).
Abdullah Aljaafari, Ahmed Sedky
doaj   +1 more source

DC Aging Mechanism of Co₂O₃-Doped ZnO Varistors

Energies, 2021
Lowered power loss and asymmetrically electrical parameters are reported in the DC aging of Co2O3-doped ZnO varistors in this paper. Based on the frequency domain dielectric responses of the pristine and degraded samples, the present study explores the ...
Xia Zhao, Haibin Shen, Men Guo, Ziming He, Yupeng Li, Ran Wen   +5 more
doaj   +1 more source

Synthesis by Hydrothermal Treatment of ZnO-Based Varistors Doped with Rare Earth Oxides and Their Characterization by Impedance Spectroscopy

Crystals, 2020
ZnO-based ceramic varistors have shown excellent electrical and dielectric properties due to their characteristics microstructures represented by the arrangement of their grains and grain boundaries that allow the absorption and flow of energy when ...
J. Porcayo-Calderon, J.J. Ramos-Hernandez, C.D. Arrieta-Gonzalez, J.G. Chacon-Nava, J.G. Gonzalez-Rodriguez, E. Porcayo-Palafox, M. Sanchez-Carrillo, J.P. Flores-De los Rios, L. Martinez-Gomez   +8 more
doaj   +1 more source

Electrical properties of ZnO varistors prepared by direct mixing of constituent phases [PDF]

Science of Sintering, 2006
Varistor samples containing different amounts of constituent phases were prepared by direct mixing of constituent phases. Detailed electrical characterization was performed to explain the influence of minor phases (spinel and intergranular phases) on ...
Žunić M., Branković Z., Branković G.
doaj   +1 more source

Microstructural Characterization of ZnO Varistors.

Journal of the Japan Society of Powder and Powder Metallurgy, 1995
Two kinds of commercial ZnO system varistors were investigated with relevance to their microstructures. Particularly, face-to-face fracture surfaces were characterized in terms of secondary electron image and backscatterd electron image to clarify the existence of precipitates at the grain-to-grain interface.
Takeda, Shunji, Koumoto, Kunihito, Yanagida, Hiroaki   +2 more
openaire   +2 more sources

Computer Simulation of ZnO Varistors Failures [PDF]

MRS Proceedings, 1997
ABSTRACTA simple thermo-mechanical model is applied to evaluate the influence of the nonuni-formity of ZnO varistor disks used in surge arresters on their energy handling capability. By solving heat transfer equations for a varistor disk with nonuniform electrical properties, we compute the time dependence of the temperature profile and the ...
Bartkowiak, M., Mahan, G. D., Comber, M. G., Alim, M. A.   +3 more
openaire   +1 more source

Electrical degradation of double-Schottky barrier in ZnO varistors

AIP Advances, 2016
Researches on electrical degradation of double-Schottky barrier in ZnO varistors are reviewed, aimed at the constitution of a full picture of universal degradation mechanism within the perspective of defect.
Jinliang He, Chenlu Cheng, Jun Hu
doaj   +1 more source

The Electrical Conductivity of the Lower Mantle From High‐Pressure/High‐Temperature Measurements of Pyrolite and Ten Years of Geomagnetic Observations

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 4, April 2026.
Abstract Electromagnetic sounding coupled with experimental measurements of electrical conductivity (EC) can provide valuable constraints on the thermochemical state of Earth's lower mantle. Here, we report a new set of experimentally determined EC values of pyrolite, a candidate composition of the lower mantle, between 25 and 80 GPa at room ...
Charlotte Trubowitz, Motohiko Murakami, Federico Munch, Alexander Grayver, Christian Liebske, Amir Khan, Nobuyoshi Miyajima, Pinku Saha, Yoshiyuki Okuda, Georg Spiekermann, Luiz Grafulha Morales   +10 more
wiley   +1 more source

Ultra‐Rapid Blacklight Sintering for ZnO‐Based Varistors With Optimized Functional Properties

Journal of the American Ceramic Society, Volume 109, Issue 3, March 2026.
ABSTRACT The increasing demand for energy‐efficient optoelectronic systems has intensified interest in high‐performance ceramic varistors, which are critical components in surge protection applications. In this study, ZnO‐based varistors were fabricated using a novel blacklight sintering (BLS) technique, which employs high‐powered blue light, and were ...
Ahmad Sayyadi‐Shahraki, Michael Scherer, Lukas Porz, Mohammad Maleki Shahraki, Till Frömling   +4 more
wiley   +1 more source