| Abstract |
A very low-tanδ ∼0.008 and giant-ε′ ∼14867 at 30 °C and 1 kHz, with a dielectric variation Δε' < ±15% over a wide temperature range of −60–200 °C that complies with the EIA standard for capacitors were obtained in a Ca0.925Pr0.05Cu3Ti4O12/TiO2 ceramic sintered at 1100 °C for 7 h. Moreover, very high values of the nonlinear coefficient (α) ∼13.55 and a breakdown field (Eb) ∼ 6013.5 V cm−1 were achieved in this ceramic. Nonlinear J-E properties of almost all ceramics can be improved by doping with Pr3+ ions. The grain density increased with the Pr3+ dopant content due to the effect of the solute drag mechanism. This caused an increase in the grain boundary resistance (RGB), leading to a wider temperature range of the thermal stability for tanδ < 0.05 and Δε' < ±15%. Incremental changes of the RGB were confirmed by impedance spectroscopy analysis. These results suggested that this material is a very good candidate for ceramic for applications in capacitors, energy storage and varistor devices that require high thermal stability. |
Publication
Journal Publication
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