Impact of calcination on low-temperature sintered Bi2O3 varistors: Varistor properties and surge current absorption
Source abstract
Abstract
This study investigated the effects of calcination on the densification, microstructure, varistor properties, and surge current absorption capability of low-temperature sintered ZnO-Bi 2O 3-Sb 2O 3-Co 3O 4-Mn 3O 4-Nb 2O 5 varistors. The ZnO, Co 3O 4, and Mn 3O 4 were premixed and calcined at various temperatures to reduce grain resistance and improve surge absorption capacity. Calcination at 600°C and 800°C, compared to 1000°C and no calcination, enhanced the surge absorption capacity, attributed to reduced grain resistivity. The introduction of trivalent Co and Mn in place of Zn 2+ ions, notably in the 600°C-calcined samples, increased donor concentration and reduced grain resistivity. Conversely, the 1000°C-calcined samples exhibited higher Schottky barriers and lower leakage currents due to increased adsorbed oxygen interacting with Co 2+ and Mn 2+ ions.
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Research context
OpenAlex topics: ZnO doping and properties · Thin-Film Transistor Technologies · Transition Metal Oxide Nanomaterials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (29)
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