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In-Situ Measurements Of The Liquid-Phase Sintering Of Zinc Oxide, Mohammad Lutful Arefin
In-Situ Measurements Of The Liquid-Phase Sintering Of Zinc Oxide, Mohammad Lutful Arefin
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Polycrystalline ceramic semiconductor devices based on ZnO and several additive oxides show highly non-ohmic current-voltage behavior similar to the Zener diodes. The devices act as an insulator up to a certain electrical field called the breakdown field (EBR) but change into a highly conducting one just above it. Below and above the breakdown field they behave perfectly ohmic. This overall non-linear current-voltage characteristic together with the ability to withstand repeated high power pulses has made metal oxide varistors popular as "surge-arrestors" in electrical circuitry.
ZnO doped with Bi2O3 and Sb2O3 (ZBS), is the basic system for ceramic varistors. Phase formation …