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The effect on the microstructure and electrical properties of (Co, Ta)-doped SnO 2 varistors upon the addition of SrCO 3 was investigated. The threshold electric field of the SnO 2 -based varistors increased significantly from 318 to 3624V/mm, the relative dielectric constants of the SnO 2 -based varistors decreased greatly from 1509 to 69 as SrCO 3 concentration...
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