Results 41 to 50 of about 1,546 (174)

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

Metastable Barrier Voltage in ZnO Varistors

, 1981
A reversible change in barrier voltage is observed in assintered ZnO varistors upon application and removal of the applied voltage. This is attributed to a metastable component in the grain boundary Schottky barriers.
Tapan K. Gupta, William G. Carlson, Barbara O. Hall   +2 more
core   +1 more source

The Role of Polypyrrole in Electrical Properties of ZnO-Polymer Composite Varistors [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2017
Composite films on the base of ZnO with different weight percentages of polypyrrole have been prepared using the hot pressing method and their current-voltage characteristics have been studied. Results show that the films have nonlinear varistor behavior
Nasim Asaadi, Mojtaba Parhizkar, Sajedeh Mohammadi Aref, Hassan Bidadi   +3 more
doaj  

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

A modelling approach to describe the DC current-voltage behaviour of low-voltage zinc oxide varistors

Open Ceramics, 2021
Zinc oxide varistors are among the most important surge arresters. The current-voltage (I–V) behaviour of these devices can be approximated by a model of electrical networks of grain boundaries arranged in 3D space, where nonlinear resistors mimic the ...
Benjamin Kaufmann, Thomas Billovits, Markus Kratzer, Christian Teichert, Peter Supancic   +4 more
doaj   +1 more source

Strain‐Induced Redistribution of Point Defects in ZnO Nanoparticles

Small Science, Volume 6, Issue 3, March 2026.
Powder compaction generates local strain effects in ZnO nanoparticles. This alters the abundance of intrinsic point defects and impacts the semiconductor's electronic structure. Such changes were analyzed by a combination of spectroscopy and density functional theory calculations and emphasize the importance of strain effects in the design and ...
Korbinian Aicher, Thomas Berger, Antonios Litovoilis, Ulrich Aschauer, Oliver Diwald   +4 more
wiley   +1 more source

Study on temperature rise prediction of ZnO varistors under multiple lightning strikes based on BP neural network and microscopic

High Temperature Materials and Processes
ZnO varistors are widely used in the field of lightning protection. After being struck by lightning, ZnO varistors absorb heat, which can lead to temperature rise and even damage, posing a serious safety threat to electrical safety.
Li Chunying, Zhang Chunlong, Lv Qing
doaj   +1 more source

Advances in the synthesis of ZnO nanomaterials for varistor devices [PDF]

Journal of Materials Chemistry C, 2013
ZnO based varistors are widely used for overvoltage protection in many electrical and electronic circuits, at voltages ranging from a few to over a million volts. By careful control of the microstructure, through nano-structuring by chemical routes, it should be possible to produce varistors with high breakdown voltage (Vc), as this is proportional to ...
Pillai, Suresh, Kelly, John M., Ramesh, Raghavendra, McCormack, Declan   +3 more
openaire   +3 more sources

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

Study on the electrical properties and microstructure of bismuth-based high voltage zinc oxide varistors [PDF]

, 2022
The author's aim is to investigate ZnO varistors with high voltage to 1000V/mm and good resistance to electrical degradation, which could be applied to the UHV transmission systems and reduce ZnO varistor element amounts in surge arresters.
30597, 50962015, 0000-0001-6099-1959, 郑, 雨萌, テイ, ウメ, Zheng, Yumeng   +5 more
core   +1 more source