Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7887717 | Ceramics International | 2018 | 23 Pages |
Abstract
It is shown that an addition of Sb2O5 or Nb2O5 (0.05-0.15â¯mol%) to the system SnO2-CoO-Cr2O3-Bi2O3 leads to the enhancement of grain growth. This effect is associated with the presence of the liquid Bi-phase in ceramics during sintering. The obtained ceramics possess non-linear current-voltage characteristics and can be used for preparing low voltage varistors. The non-linearity coefficient α reaches 22 and the characteristic electric field 692â¯V/cm for Nb-doped materials and 11 and 421â¯V/cm respectively for Sb-doped ceramics materials. The results of dc and ac electrical measurements, as well as scanning electron microscopy are presented and discussed in terms of the known barrier model for varistors.
Keywords
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Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Alexander N. Bondarchuk, Alexander B. Glot, Alma R. Velasco-Rosales,