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The effects of Sc 2 O 3 on the properties of (Co, Ta)-doped SnO 2 varistors were investigated. It was found that the nonlinear coefficient presents a peak of α=19.3 for the sample doped with 0.05mol% Sc 2 O 3 . The breakdown electrical field increased from 303 to 1281V/mm and relative dielectric constant decreased from 921 to 117 with increasing Sc 2 ...
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