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<p>The study investigates the electrical and dielectric properties of polar and non-polar polymer-based composites and Si-based composite varistors across a range of temperatures. Current-voltage characteristics (CVC) were measured, and the real (<i>ε</i>′) and imaginary (<i>ε</i>″) components of the dielectric constant were calculated at different frequencies. The results show that the CVC exhibits non-linearity over the entire measured temperature range, with the breakdown voltage shifting to lower electric fields as temperature increases. The polar polymer-based composites exhibit a current flow approximately five times higher than non-polar composites under the same applied voltage. For polar polymer composites, the dielectric constant (<i>ε</i>) increases monotonically with rising temperature, whereas non-polar polymer composites show a sharp decline in <i>ε</i> with temperature. A decrease in <i>ε</i>″ and loss tangent (tgδ) was observed with increasing temperature. The electrical conductivity (<i>σ</i>) of polar polymer composites decreases monotonically as temperature increases. In contrast, for non-polar polymer composites, <i>σ</i> decreases sharply at low voltages (&lt;50 V) with increasing temperature, while at higher temperatures, <i>σ</i> increases. These findings highlight the contrasting behaviors of polar and non-polar polymer composites under varying thermal and electrical conditions, offering insights into optimizing materials for advanced dielectric and varistor applications.</p> Graphical Abstract <p></p>

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Investigation of temperature measurements of silicon-containing nonlinear composite varistors

  • 期刊论文

  • 发表日期：

    2025年6月7日

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  • Shafaq Ahadzade,
  • Tarana Nurubeyli,
  • Gulshan Mammadova,
  • Flora V. Hajiyeva

摘要

The study investigates the electrical and dielectric properties of polar and non-polar polymer-based composites and Si-based composite varistors across a range of temperatures. Current-voltage characteristics (CVC) were measured, and the real (ε′) and imaginary (ε″) components of the dielectric constant were calculated at different frequencies. The results show that the CVC exhibits non-linearity over the entire measured temperature range, with the breakdown voltage shifting to lower electric fields as temperature increases. The polar polymer-based composites exhibit a current flow approximately five times higher than non-polar composites under the same applied voltage. For polar polymer composites, the dielectric constant (ε) increases monotonically with rising temperature, whereas non-polar polymer composites show a sharp decline in ε with temperature. A decrease in ε″ and loss tangent (tgδ) was observed with increasing temperature. The electrical conductivity (σ) of polar polymer composites decreases monotonically as temperature increases. In contrast, for non-polar polymer composites, σ decreases sharply at low voltages (<50 V) with increasing temperature, while at higher temperatures, σ increases. These findings highlight the contrasting behaviors of polar and non-polar polymer composites under varying thermal and electrical conditions, offering insights into optimizing materials for advanced dielectric and varistor applications.

Graphical Abstract