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High-Energy Density Dielectrics and Capacitors for Elevated Temperatures: Ca(Zr,Ti)O3

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Author to whom correspondence should be addressed. e-mail: car4@psu.edu

Abstract

The Ca(Zr1−xTix)O3 (CZT) solid solution system is a linear dielectric that is of interest for high-temperature power capacitor applications. This dielectric was synthesized by conventional solid-state processes and prototyped into single-layer CZT capacitors, which were fabricated with interdigitated electrodes cofired between dielectric layers ~10-μm thick. The dielectric properties of these capacitors were extensively investigated as a function of Zr/Ti ratio on the CaZrO3 side of the solid solution. The electrostatic energy density and breakdown strength of the CZT capacitors were investigated by measuring polarization–electric field curves as a function of temperature from room temperature to 250°C. The Ca(Zr0.80Ti0.20)O3 capacitors show high electrostatic energy density of 4 J/cm3 at 250°C. Highly accelerated life testing (HALT) was also performed on these dielectrics, and we quantified the thermal stimulated depolarization current (TSDC) to access the major point defects in the CZT system.

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