Results 41 to 50 of about 2,070 (218)

Microstructure and Degree of Degradation of ZnO Varistors in Surge Arresters Due to Operation [PDF]

Archives of Metallurgy and Materials, 2018
The paper presents the test results for the microstructure of ZnO varistors comprising high voltage gapless surge arresters. The tests were performed on varistors produced in different periods and by various manufacturers.
P. Papliński, J. Wańkowicz, P. Ranachowski, Z. Ranachowski   +3 more
doaj   +1 more source

Chemical Control of Space Charge Barriers and Grain Boundary Resistances in Polycrystalline Ionic Conductors

Advanced Functional Materials, Volume 36, Issue 74, 14 September 2026.
Grain boundaries (GBs) in polycrystalline materials often block charge transport and drive degradation. Using Gd‐doped CeO2 as a model electrolyte used in fuel/electrolysis cells, we developed a core‐shell infiltration method to selectively modify GB chemistry and space charge potential, achieving orders‐of‐magnitude ionic conductivity changes.
Z. Sha, T. Defferriere, C. Gilgenbach, J. M. LeBeau, I. Lubomirsky, H. L. Tuller   +5 more
wiley   +1 more source

Development of SNO2 based varistors -electrical behavior and pulse degradation comparatively to ZNO varistors

, 2017
This work presents the most relevant aspects of the SNO2 based varistors technology and a comparative study of its non linear behavior in relation to ZnO (modified Matsuoka system) varistors.
Longo, E. [UNESP], Bassi, W., Varela, J. A. [UNESP], Bueno, P. R. [UNESP], Ramirez, M. A. [UNESP]   +4 more
core   +1 more source

Current localization, non-uniform heating, and failures of ZnO varistors [PDF]

, 1997
Metal oxide varistors have highly nonlinear electrical characteristics and are widely used as devices for over-voltage protection. Varistor applications range from the use of small varistors to protect delicate electronic components to the use of much ...
Bartkowiak, M., M. Bartkowiak
core   +1 more source

Aging Effects on PTCR Ceramics: SEM and C‐AFM Analysis of Electrical Conductivity and Domain Structures

International Journal of Applied Ceramic Technology, Volume 23, Issue 4, August 2026.
ABSTRACT This study examines the impact of aging on the electrical and structural properties of positive temperature coefficient of resistance (PTCR) ceramics. The presented study introduces a correlative scanning electron microscopy (SEM)/conductive atomic force microscopy (C‐AFM) approach enabling repeated, site‐specific characterization of ...
Kryštof Koller, Filip Ulč, Patrik Sokola, Veronika Hegrová, Petr Ptáček   +4 more
wiley   +1 more source

Electrical and microstructural properties of microwave sintered SnO2-based varistors Propriedades elétricas e microestruturais de varistores à base de SnO2 sinterizados por microondas

Cerâmica, 2012
An investigation was made of the microstructural and electrical properties of SnO2-based varistors microwave sintered at 1200 ºC, applying a heating rate of 120 ºC/min and treatment times of 10, 20, 30, 40, 50 and 60 min.
P. S. Furtado, M. M. Oliveira, J. S. Vasconcelos, J. H. G. Rangel, E. Longo, V. C de Sousa   +5 more
doaj   +1 more source

Performance and Mechanism Research on ZnO Varistor Ceramics Prepared by Microwave Sintering

International Journal of Ceramic Engineering &Science, Volume 8, Issue 4, July 2026.
Microwave sintering yields superior electrical performance of ZnO varistor ceramics versus conventional sintering, clarifies its grain boundary defect regulation mechanism, and provides a low‐energy, high‐efficiency preparation strategy. ABSTRACT To solve the problems of high sintering temperature, uneven grain growth, and limited electrical property ...
Zhiyao Fu, Haocheng Liu, Bowen Wang, Zhenglong Jiang   +3 more
wiley   +1 more source

Nature and Characteristics of a Voltage-Biased Varistor and its Embedded Transistor

IEEE Journal of the Electron Devices Society, 2015
An unorthodox approach for producing simple and yet practical transistors based on ceramic platforms is discussed in this paper. To achieve this, we modify the original nonlinear current-voltage (I-V) characteristics of a varistor by superimposing a ...
Raghvendra K. Pandey, William A. Stapleton, Ivan Sutanto   +2 more
doaj   +1 more source

Analysis of the Anti High‐Altitude Electromagnetic Pulse Interference Ability of Relay Protection Devices

High Voltage, Volume 11, Issue 3, Page 738-750, June 2026.
ABSTRACT High altitude electromagnetic pulse (HEMP), as a steep slope and high amplitude instantaneous energy shock, has stronger coupling and greater destructive power, which can easily cause the secondary control device of the substation to malfunction.
Long Jin, Guanglong Zhou, Weidong Zhang, Zexin Zhou, Guosheng Yang, Rongrong Zhan   +5 more
wiley   +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%.
Fukumori, Ai, Kubota, Atsuko, Sato, Yuuki, Yoshikado, Shinzo   +3 more
openaire   +1 more source