Effects of Sb and Nb dopants on electrical and microstructural properties of low-voltage varistor ceramics based on SnO2
Source abstract
Abstract
Abstract It is shown that an addition of Sb2O5 or Nb2O5 (0.05–0.15 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 692 V/cm for Nb-doped materials and 11 and 421 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.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Thermography and Photoacoustic Techniques · Electrical and Thermal Properties of Materials · Transition Metal Oxide Nanomaterials
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References (27)
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