Results 31 to 40 of about 435 (184)

Synthesis of SnO2 nanoparticles and their use in the fabrication of varistors

Revista Facultad de Ingeniería Universidad de Antioquia, 2014
SnO2 nanoparticles doped with TiO2, CoO, Nb2O3 and Al2O3 were obtained in this work using the methods of coprecipitation and polymeric precursor. X Ray Diffraction (XRD), and Scanning Electron Microscopy (SEM) were used to characterize the ceramic ...
Adolfo Alfredo Mosquera-Lozano, José Arana-Varela, Jorge Enrique Rodríguez-Páez   +2 more
doaj   +1 more source

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

Mechanism of Quasi‐Power‐Frequency Resonant Overvoltage Triggered by Multiple Lightning Strikes in High‐Voltage Alternating Current Systems Equipped With Shunt Reactor

High Voltage, EarlyView.
ABSTRACT This paper investigates the generation mechanism of quasi‐power‐frequency resonant overvoltage triggered by multiple lightning strikes in high‐voltage alternating current (HVAC) systems equipped with shunt reactors. Based on field measurements from a 500 kV AC system, equivalent and simplified circuit models have been established to analyse ...
Tao Liang, Tao Cui, Zhengxi Wang, Tongwei Guo, Xiaohui Wu, Hong Zeng, Jie Guo, Yanzhao Xie   +7 more
wiley   +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

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

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

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

Grain Boundary Space Charge Engineering of Solid Oxide Electrolytes: Model Thin Film Study

Advanced Functional Materials, Volume 36, Issue 14, 16 February 2026.
This study demonstrates unprecedented control of grain boundary electrical properties in solid electrolytes. Selective diffusion of cations through grain boundaries in thin films enables 12 orders of magnitude variation in ionic resistance, proving that systematic chemical modification of grain boundary electrical properties is feasible.
Thomas Defferriere, Yong Beom Kim, Colin Gilgenbach, James M. LeBeau, WooChul Jung, Harry L. Tuller   +5 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