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The infiltration of molten Bi 2 O 3 into ZnO varistors was carried out. The sintered varistor disks doped with Bi 2 O 3 were painted by Bi 2 O 3 paste on the surfaces and then were reheat-treated. The DC degradation test was carried out to demonstrate the electrical stability of varistors. The influence of the Bi 2 O 3 infiltration on...
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